TY  - JOUR
AU  - Uskoković, Vuk
AU  - Tang, Sean
AU  - Nikolić, Marko G.
AU  - Marković, Smilja
AU  - Wu, Victoria M.
PY  - 2019
UR  - https://avs.scitation.org/doi/abs/10.1116/1.5090396
UR  - https://dais.sanu.ac.rs/123456789/6468
AB  - One of the main goals of materials science in the 21st century is the development of materials with rationally designed properties as substitutes for traditional pharmacotherapies. At the same time, there is a lack of understanding of the exact material properties that induce therapeutic effects in biological systems, which limits their rational optimization for the related medical applications. This study sets the foundation for a general approach for elucidating nanoparticle properties as determinants of antibacterial activity, with a particular focus on calcium phosphate nanoparticles. To that end, nine physicochemical effects were studied and a number of them were refuted, thus putting an end to frequently erred hypotheses in the literature. Rather than having one key particle property responsible for eliciting the antibacterial effect, a complex synergy of factors is shown to be at work, including (a) nanoscopic size; (b) elevated intracellular free calcium levels due to nanoparticle solubility; (c) diffusivity and favorable electrostatic properties of the nanoparticle surface, primarily low net charge and high charge density; and (d) the dynamics of perpetual exchange of ultrafine clusters across the particle/solution interface. On the positive side, this multifaceted mechanism is less prone to induce bacterial resistance to the therapy and can be a gateway to the sphere of personalized medicine. On a more problematic side, it implies a less intense effect compared to single-target molecular therapies and a difficulty of elucidating the exact mechanisms of action, while also making the rational design of theirs for this type of medical application a challenge.
PB  - AIP Publishing LLC
T2  - Biointerphases
T1  - Calcium phosphate nanoparticles as intrinsic inorganic antimicrobials: In search of the key particle property
SP  - 031001
VL  - 14
IS  - 3
DO  - 10.1116/1.5090396
UR  - https://hdl.handle.net/21.15107/rcub_dais_6468
ER  - 

@article{
author = "Uskoković, Vuk and Tang, Sean and Nikolić, Marko G. and Marković, Smilja and Wu, Victoria M.",
year = "2019",
abstract = "One of the main goals of materials science in the 21st century is the development of materials with rationally designed properties as substitutes for traditional pharmacotherapies. At the same time, there is a lack of understanding of the exact material properties that induce therapeutic effects in biological systems, which limits their rational optimization for the related medical applications. This study sets the foundation for a general approach for elucidating nanoparticle properties as determinants of antibacterial activity, with a particular focus on calcium phosphate nanoparticles. To that end, nine physicochemical effects were studied and a number of them were refuted, thus putting an end to frequently erred hypotheses in the literature. Rather than having one key particle property responsible for eliciting the antibacterial effect, a complex synergy of factors is shown to be at work, including (a) nanoscopic size; (b) elevated intracellular free calcium levels due to nanoparticle solubility; (c) diffusivity and favorable electrostatic properties of the nanoparticle surface, primarily low net charge and high charge density; and (d) the dynamics of perpetual exchange of ultrafine clusters across the particle/solution interface. On the positive side, this multifaceted mechanism is less prone to induce bacterial resistance to the therapy and can be a gateway to the sphere of personalized medicine. On a more problematic side, it implies a less intense effect compared to single-target molecular therapies and a difficulty of elucidating the exact mechanisms of action, while also making the rational design of theirs for this type of medical application a challenge.",
publisher = "AIP Publishing LLC",
journal = "Biointerphases",
title = "Calcium phosphate nanoparticles as intrinsic inorganic antimicrobials: In search of the key particle property",
pages = "031001",
volume = "14",
number = "3",
doi = "10.1116/1.5090396",
url = "https://hdl.handle.net/21.15107/rcub_dais_6468"
}

Uskoković, V., Tang, S., Nikolić, M. G., Marković, S.,& Wu, V. M.. (2019). Calcium phosphate nanoparticles as intrinsic inorganic antimicrobials: In search of the key particle property. in Biointerphases
AIP Publishing LLC., 14(3), 031001.
https://doi.org/10.1116/1.5090396
https://hdl.handle.net/21.15107/rcub_dais_6468

Uskoković V, Tang S, Nikolić MG, Marković S, Wu VM. Calcium phosphate nanoparticles as intrinsic inorganic antimicrobials: In search of the key particle property. in Biointerphases. 2019;14(3):031001.
doi:10.1116/1.5090396
https://hdl.handle.net/21.15107/rcub_dais_6468 .

Uskoković, Vuk, Tang, Sean, Nikolić, Marko G., Marković, Smilja, Wu, Victoria M., "Calcium phosphate nanoparticles as intrinsic inorganic antimicrobials: In search of the key particle property" in Biointerphases, 14, no. 3 (2019):031001,
https://doi.org/10.1116/1.5090396 .,
https://hdl.handle.net/21.15107/rcub_dais_6468 .

TY  - JOUR
AU  - Uskoković, Vuk
AU  - Tang, Sean
AU  - Nikolić, Marko G.
AU  - Marković, Smilja
AU  - Wu, Victoria M.
PY  - 2019
UR  - https://avs.scitation.org/doi/abs/10.1116/1.5090396
UR  - https://dais.sanu.ac.rs/123456789/6469
AB  - One of the main goals of materials science in the 21st century is the development of materials with rationally designed properties as substitutes for traditional pharmacotherapies. At the same time, there is a lack of understanding of the exact material properties that induce therapeutic effects in biological systems, which limits their rational optimization for the related medical applications. This study sets the foundation for a general approach for elucidating nanoparticle properties as determinants of antibacterial activity, with a particular focus on calcium phosphate nanoparticles. To that end, nine physicochemical effects were studied and a number of them were refuted, thus putting an end to frequently erred hypotheses in the literature. Rather than having one key particle property responsible for eliciting the antibacterial effect, a complex synergy of factors is shown to be at work, including (a) nanoscopic size; (b) elevated intracellular free calcium levels due to nanoparticle solubility; (c) diffusivity and favorable electrostatic properties of the nanoparticle surface, primarily low net charge and high charge density; and (d) the dynamics of perpetual exchange of ultrafine clusters across the particle/solution interface. On the positive side, this multifaceted mechanism is less prone to induce bacterial resistance to the therapy and can be a gateway to the sphere of personalized medicine. On a more problematic side, it implies a less intense effect compared to single-target molecular therapies and a difficulty of elucidating the exact mechanisms of action, while also making the rational design of theirs for this type of medical application a challenge.
PB  - AIP Publishing LLC
T2  - Biointerphases
T1  - Calcium phosphate nanoparticles as intrinsic inorganic antimicrobials: In search of the key particle property
SP  - 031001
VL  - 14
IS  - 3
DO  - 10.1116/1.5090396
UR  - https://hdl.handle.net/21.15107/rcub_dais_6469
ER  - 

@article{
author = "Uskoković, Vuk and Tang, Sean and Nikolić, Marko G. and Marković, Smilja and Wu, Victoria M.",
year = "2019",
abstract = "One of the main goals of materials science in the 21st century is the development of materials with rationally designed properties as substitutes for traditional pharmacotherapies. At the same time, there is a lack of understanding of the exact material properties that induce therapeutic effects in biological systems, which limits their rational optimization for the related medical applications. This study sets the foundation for a general approach for elucidating nanoparticle properties as determinants of antibacterial activity, with a particular focus on calcium phosphate nanoparticles. To that end, nine physicochemical effects were studied and a number of them were refuted, thus putting an end to frequently erred hypotheses in the literature. Rather than having one key particle property responsible for eliciting the antibacterial effect, a complex synergy of factors is shown to be at work, including (a) nanoscopic size; (b) elevated intracellular free calcium levels due to nanoparticle solubility; (c) diffusivity and favorable electrostatic properties of the nanoparticle surface, primarily low net charge and high charge density; and (d) the dynamics of perpetual exchange of ultrafine clusters across the particle/solution interface. On the positive side, this multifaceted mechanism is less prone to induce bacterial resistance to the therapy and can be a gateway to the sphere of personalized medicine. On a more problematic side, it implies a less intense effect compared to single-target molecular therapies and a difficulty of elucidating the exact mechanisms of action, while also making the rational design of theirs for this type of medical application a challenge.",
publisher = "AIP Publishing LLC",
journal = "Biointerphases",
title = "Calcium phosphate nanoparticles as intrinsic inorganic antimicrobials: In search of the key particle property",
pages = "031001",
volume = "14",
number = "3",
doi = "10.1116/1.5090396",
url = "https://hdl.handle.net/21.15107/rcub_dais_6469"
}

Uskoković, V., Tang, S., Nikolić, M. G., Marković, S.,& Wu, V. M.. (2019). Calcium phosphate nanoparticles as intrinsic inorganic antimicrobials: In search of the key particle property. in Biointerphases
AIP Publishing LLC., 14(3), 031001.
https://doi.org/10.1116/1.5090396
https://hdl.handle.net/21.15107/rcub_dais_6469

Uskoković V, Tang S, Nikolić MG, Marković S, Wu VM. Calcium phosphate nanoparticles as intrinsic inorganic antimicrobials: In search of the key particle property. in Biointerphases. 2019;14(3):031001.
doi:10.1116/1.5090396
https://hdl.handle.net/21.15107/rcub_dais_6469 .

Uskoković, Vuk, Tang, Sean, Nikolić, Marko G., Marković, Smilja, Wu, Victoria M., "Calcium phosphate nanoparticles as intrinsic inorganic antimicrobials: In search of the key particle property" in Biointerphases, 14, no. 3 (2019):031001,
https://doi.org/10.1116/1.5090396 .,
https://hdl.handle.net/21.15107/rcub_dais_6469 .

TY  - JOUR
AU  - Ignjatović, Nenad
AU  - Sakač, Marija
AU  - Kuzminac, Ivana
AU  - Kojić, Vesna
AU  - Marković, Smilja
AU  - Vasiljević Radović, Dana
AU  - Wu, Victoria M.
AU  - Uskoković, Vuk
AU  - Uskoković, Dragan
PY  - 2018
UR  - https://pubs.rsc.org/en/content/articlelanding/2018/tb/c8tb01995a
UR  - https://dais.sanu.ac.rs/123456789/4509
AB  - Low targeting efficiency and fast metabolism of antineoplastic drugs are hindrances to effective chemotherapies and there is an ongoing search for better drugs, but also better carriers. Steroid derivatives, 3β-hydroxy-16-hydroxymino-androst-5-en-17-one (A) and 3β,17β-dihydroxy-16-hydroxymino-androst-5-ene (B) as cancer growth inhibitors were chemically synthesized and captured in a carrier composed of hydroxyapatite (HAp) nanoparticles coated with chitosan oligosaccharide lactate (ChOLS). The only difference between the two derivatives is that A has a carbonyl group at the C17 position of the five-membered ring and B has a hydroxyl. This small difference in the structure resulted not only in different physicochemical properties of the A- and B-loaded HAp/ChOSL, but also in different biological activities. The morphology of drug-loaded HAp/ChOSL particles was spherical, but the size depended on the drug identity: d50 = 138 nm for A-loaded HAp/ChOSL and d50 = 223 nm for B-loaded HAp/ChOSL. Cell-selective toxicity was tested against human breast carcinoma (MCF7 and MDA-MB-231), human lung carcinoma (A549) and human lung fibroblasts (MRC-5). The small selectivity of pure derivatives A and B toward breast cancer cells became drastically increased when they were delivered using HAp/ChOSL particles. Whereas the ratio of the cytotoxicity imposed onto breast cancer cells and the cytotoxicity imposed onto healthy MRC-5 fibroblasts ranged from 1.5 to 1.7 for pure A and from 1.5 to 2.3 for pure derivative B depending on the concentration, it increased to 5.4 for A-loaded HAp/ChOSL and 5.1 for B-loaded HAp/ChOSL. FACS analysis demonstrated poor uptake of HAp/ChOSL particles by MCF7 cells, suggesting that the drug release occurs extracellularly. The augmented activity of the drugs was most likely due to sustained release, although the favorable positive charge of the carrier, allowing it to adhere to the negatively charged plasma membrane and release the drugs steadily and directly to the hydrophobic cell membrane milieu, was delineated as a possible complementary mechanism.
PB  - Royal Society of Chemistry
T2  - Journal of Materials Chemistry B
T1  - Chitosan oligosaccharide lactate coated hydroxyapatite nanoparticles as a vehicle for the delivery of steroid drugs and the targeting of breast cancer cells
SP  - 6957
EP  - 696
VL  - 6
DO  - 10.1039/C8TB01995A
UR  - https://hdl.handle.net/21.15107/rcub_dais_4509
ER  - 

@article{
author = "Ignjatović, Nenad and Sakač, Marija and Kuzminac, Ivana and Kojić, Vesna and Marković, Smilja and Vasiljević Radović, Dana and Wu, Victoria M. and Uskoković, Vuk and Uskoković, Dragan",
year = "2018",
abstract = "Low targeting efficiency and fast metabolism of antineoplastic drugs are hindrances to effective chemotherapies and there is an ongoing search for better drugs, but also better carriers. Steroid derivatives, 3β-hydroxy-16-hydroxymino-androst-5-en-17-one (A) and 3β,17β-dihydroxy-16-hydroxymino-androst-5-ene (B) as cancer growth inhibitors were chemically synthesized and captured in a carrier composed of hydroxyapatite (HAp) nanoparticles coated with chitosan oligosaccharide lactate (ChOLS). The only difference between the two derivatives is that A has a carbonyl group at the C17 position of the five-membered ring and B has a hydroxyl. This small difference in the structure resulted not only in different physicochemical properties of the A- and B-loaded HAp/ChOSL, but also in different biological activities. The morphology of drug-loaded HAp/ChOSL particles was spherical, but the size depended on the drug identity: d50 = 138 nm for A-loaded HAp/ChOSL and d50 = 223 nm for B-loaded HAp/ChOSL. Cell-selective toxicity was tested against human breast carcinoma (MCF7 and MDA-MB-231), human lung carcinoma (A549) and human lung fibroblasts (MRC-5). The small selectivity of pure derivatives A and B toward breast cancer cells became drastically increased when they were delivered using HAp/ChOSL particles. Whereas the ratio of the cytotoxicity imposed onto breast cancer cells and the cytotoxicity imposed onto healthy MRC-5 fibroblasts ranged from 1.5 to 1.7 for pure A and from 1.5 to 2.3 for pure derivative B depending on the concentration, it increased to 5.4 for A-loaded HAp/ChOSL and 5.1 for B-loaded HAp/ChOSL. FACS analysis demonstrated poor uptake of HAp/ChOSL particles by MCF7 cells, suggesting that the drug release occurs extracellularly. The augmented activity of the drugs was most likely due to sustained release, although the favorable positive charge of the carrier, allowing it to adhere to the negatively charged plasma membrane and release the drugs steadily and directly to the hydrophobic cell membrane milieu, was delineated as a possible complementary mechanism.",
publisher = "Royal Society of Chemistry",
journal = "Journal of Materials Chemistry B",
title = "Chitosan oligosaccharide lactate coated hydroxyapatite nanoparticles as a vehicle for the delivery of steroid drugs and the targeting of breast cancer cells",
pages = "6957-696",
volume = "6",
doi = "10.1039/C8TB01995A",
url = "https://hdl.handle.net/21.15107/rcub_dais_4509"
}

Ignjatović, N., Sakač, M., Kuzminac, I., Kojić, V., Marković, S., Vasiljević Radović, D., Wu, V. M., Uskoković, V.,& Uskoković, D.. (2018). Chitosan oligosaccharide lactate coated hydroxyapatite nanoparticles as a vehicle for the delivery of steroid drugs and the targeting of breast cancer cells. in Journal of Materials Chemistry B
Royal Society of Chemistry., 6, 6957-696.
https://doi.org/10.1039/C8TB01995A
https://hdl.handle.net/21.15107/rcub_dais_4509

Ignjatović N, Sakač M, Kuzminac I, Kojić V, Marković S, Vasiljević Radović D, Wu VM, Uskoković V, Uskoković D. Chitosan oligosaccharide lactate coated hydroxyapatite nanoparticles as a vehicle for the delivery of steroid drugs and the targeting of breast cancer cells. in Journal of Materials Chemistry B. 2018;6:6957-696.
doi:10.1039/C8TB01995A
https://hdl.handle.net/21.15107/rcub_dais_4509 .

Ignjatović, Nenad, Sakač, Marija, Kuzminac, Ivana, Kojić, Vesna, Marković, Smilja, Vasiljević Radović, Dana, Wu, Victoria M., Uskoković, Vuk, Uskoković, Dragan, "Chitosan oligosaccharide lactate coated hydroxyapatite nanoparticles as a vehicle for the delivery of steroid drugs and the targeting of breast cancer cells" in Journal of Materials Chemistry B, 6 (2018):6957-696,
https://doi.org/10.1039/C8TB01995A .,
https://hdl.handle.net/21.15107/rcub_dais_4509 .

TY  - JOUR
AU  - Ignjatović, Nenad
AU  - Sakač, Marija
AU  - Kuzminac, Ivana
AU  - Kojić, Vesna
AU  - Marković, Smilja
AU  - Vasiljević Radović, Dana
AU  - Wu, Victoria
AU  - Uskoković, Vuk
AU  - Uskoković, Dragan
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/4066
AB  - Low targeting efficiency and fast metabolism of antineoplastic drugs are hindrances to effective chemotherapies and there is an ongoing search for better drugs, but also better carriers. Steroid derivatives, 3β-hydroxy-16-hydroxymino-androst-5-en-17-one (A) and 3β,17β-dihydroxy-16-hydroxymino-androst-5-ene (B) as cancer growth inhibitors were chemically synthesized and captured in a carrier composed of hydroxyapatite (HAp) nanoparticles coated with chitosan oligosaccharide lactate (ChOLS). The only difference between the two derivatives is that A has a carbonyl group at the C17 position of the five-membered ring and B has a hydroxyl. This small difference in the structure resulted not only in different physicochemical properties of the A- and B-loaded HAp/ChOSL, but also in different biological activities. The morphology of drug-loaded HAp/ChOSL particles was spherical, but the size depended on the drug identity: d50 = 138 nm for A-loaded HAp/ChOSL and d50 = 223 nm for B-loaded HAp/ChOSL. Cell-selective toxicity was tested against human breast carcinoma (MCF7 and MDA-MB-231), human lung carcinoma (A549) and human lung fibroblasts (MRC-5). The small selectivity of pure derivatives A and B toward breast cancer cells became drastically increased when they were delivered using HAp/ChOSL particles. Whereas the ratio of the cytotoxicity imposed onto breast cancer cells and the cytotoxicity imposed onto healthy MRC-5 fibroblasts ranged from 1.5 to 1.7 for pure A and from 1.5 to 2.3 for pure derivative B depending on the concentration, it increased to 5.4 for A-loaded HAp/ChOSL and 5.1 for B-loaded HAp/ChOSL. FACS analysis demonstrated poor uptake of HAp/ChOSL particles by MCF7 cells, suggesting that the drug release occurs extracellularly. The augmented activity of the drugs was most likely due to sustained release, although the favorable positive charge of the carrier, allowing it to adhere to the negatively charged plasma membrane and release the drugs steadily and directly to the hydrophobic cell membrane milieu, was delineated as a possible complementary mechanism.
PB  - Royal Society of Chemistry
T2  - Journal of Materials Chemistry B
T1  - Chitosan oligosaccharide lactate coated hydroxyapatite nanoparticles as a vehicle for the delivery of steroid drugs and the targeting of breast cancer cells
SP  - 6957
EP  - 6968
VL  - 6
DO  - 10.1039/C8TB01995A
UR  - https://hdl.handle.net/21.15107/rcub_dais_4066
ER  - 

@article{
author = "Ignjatović, Nenad and Sakač, Marija and Kuzminac, Ivana and Kojić, Vesna and Marković, Smilja and Vasiljević Radović, Dana and Wu, Victoria and Uskoković, Vuk and Uskoković, Dragan",
year = "2018",
abstract = "Low targeting efficiency and fast metabolism of antineoplastic drugs are hindrances to effective chemotherapies and there is an ongoing search for better drugs, but also better carriers. Steroid derivatives, 3β-hydroxy-16-hydroxymino-androst-5-en-17-one (A) and 3β,17β-dihydroxy-16-hydroxymino-androst-5-ene (B) as cancer growth inhibitors were chemically synthesized and captured in a carrier composed of hydroxyapatite (HAp) nanoparticles coated with chitosan oligosaccharide lactate (ChOLS). The only difference between the two derivatives is that A has a carbonyl group at the C17 position of the five-membered ring and B has a hydroxyl. This small difference in the structure resulted not only in different physicochemical properties of the A- and B-loaded HAp/ChOSL, but also in different biological activities. The morphology of drug-loaded HAp/ChOSL particles was spherical, but the size depended on the drug identity: d50 = 138 nm for A-loaded HAp/ChOSL and d50 = 223 nm for B-loaded HAp/ChOSL. Cell-selective toxicity was tested against human breast carcinoma (MCF7 and MDA-MB-231), human lung carcinoma (A549) and human lung fibroblasts (MRC-5). The small selectivity of pure derivatives A and B toward breast cancer cells became drastically increased when they were delivered using HAp/ChOSL particles. Whereas the ratio of the cytotoxicity imposed onto breast cancer cells and the cytotoxicity imposed onto healthy MRC-5 fibroblasts ranged from 1.5 to 1.7 for pure A and from 1.5 to 2.3 for pure derivative B depending on the concentration, it increased to 5.4 for A-loaded HAp/ChOSL and 5.1 for B-loaded HAp/ChOSL. FACS analysis demonstrated poor uptake of HAp/ChOSL particles by MCF7 cells, suggesting that the drug release occurs extracellularly. The augmented activity of the drugs was most likely due to sustained release, although the favorable positive charge of the carrier, allowing it to adhere to the negatively charged plasma membrane and release the drugs steadily and directly to the hydrophobic cell membrane milieu, was delineated as a possible complementary mechanism.",
publisher = "Royal Society of Chemistry",
journal = "Journal of Materials Chemistry B",
title = "Chitosan oligosaccharide lactate coated hydroxyapatite nanoparticles as a vehicle for the delivery of steroid drugs and the targeting of breast cancer cells",
pages = "6957-6968",
volume = "6",
doi = "10.1039/C8TB01995A",
url = "https://hdl.handle.net/21.15107/rcub_dais_4066"
}

Ignjatović, N., Sakač, M., Kuzminac, I., Kojić, V., Marković, S., Vasiljević Radović, D., Wu, V., Uskoković, V.,& Uskoković, D.. (2018). Chitosan oligosaccharide lactate coated hydroxyapatite nanoparticles as a vehicle for the delivery of steroid drugs and the targeting of breast cancer cells. in Journal of Materials Chemistry B
Royal Society of Chemistry., 6, 6957-6968.
https://doi.org/10.1039/C8TB01995A
https://hdl.handle.net/21.15107/rcub_dais_4066

Ignjatović N, Sakač M, Kuzminac I, Kojić V, Marković S, Vasiljević Radović D, Wu V, Uskoković V, Uskoković D. Chitosan oligosaccharide lactate coated hydroxyapatite nanoparticles as a vehicle for the delivery of steroid drugs and the targeting of breast cancer cells. in Journal of Materials Chemistry B. 2018;6:6957-6968.
doi:10.1039/C8TB01995A
https://hdl.handle.net/21.15107/rcub_dais_4066 .

Ignjatović, Nenad, Sakač, Marija, Kuzminac, Ivana, Kojić, Vesna, Marković, Smilja, Vasiljević Radović, Dana, Wu, Victoria, Uskoković, Vuk, Uskoković, Dragan, "Chitosan oligosaccharide lactate coated hydroxyapatite nanoparticles as a vehicle for the delivery of steroid drugs and the targeting of breast cancer cells" in Journal of Materials Chemistry B, 6 (2018):6957-6968,
https://doi.org/10.1039/C8TB01995A .,
https://hdl.handle.net/21.15107/rcub_dais_4066 .

TY  - JOUR
AU  - Uskoković, Vuk
AU  - Marković, Smilja
AU  - Veselinović, Ljiljana
AU  - Škapin, Srečo Davor
AU  - Ignjatović, Nenad
AU  - Uskoković, Dragan
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/4514
AB  - Transformations between amorphous and crystalline apatite mechanistically govern some of the most essential processes in bone metabolism, including biomineralization and bone remodeling. Fundamental understanding of this phase transition can help us gain control over the formation and dissolution of boney tissues in vivo and utilize that knowledge for various therapeutic ends. Crystallization of hydroxyapatite (HAp) and two tricalcium phosphate (TCP) polymorphs from the metastable precursor, amorphous calcium phosphate (ACP) was here studied kinetically and mechanistically using thermal analyses, X-ray diffraction and Fourier-transform infrared spectroscopy. Crystallization was detected in the differential thermal analysis as the exothermic peak at 639.5 °C at the slowest heating regimen of 5 °C min−1, while a combination of different kinetics models, including Augis–Bennett, Borchardt–Daniels, Johnson–Mehl–Avrami, Kissinger, Ozawa and Piloyan, yielded activation energies in the 435–450 kJ mol−1 range. Dehydrated ACP required a significant energy input to transform to HAp, thus indirectly proving the key role that structural water plays in this process in a biological setting. The phase transformation at high temperatures involved preformed nuclei and was solely due to their 3D growth, contrasting the edge-controlled nucleation derived earlier as the mechanism of growth in the solution. Crystallization was in both cases accompanied by the formation of needle-shape crystals of HAp through aggregation of ultrafine spherical units of ACP. Relationship between crystallinity and the heating rate was detected only for the initially amorphous structure, indicating a more intense and coherent lattice ordering process in annealed ACP than in HAp. Despite that, crystallization disobeyed the rule of inverse proportionality between the thermal energy required for the relaxation of defects and the level of strain, as the recovery rate of the initially poorly crystalline HAp was higher than that of ACP.
PB  - Royal Society of Chemistry (RSC)
T2  - Physical Chemistry Chemical Physics
T1  - Insights into the kinetics of thermally induced crystallization of amorphous calcium phosphate
SP  - 29221
EP  - 29235
VL  - 20
DO  - 10.1039/C8CP06460A
UR  - https://hdl.handle.net/21.15107/rcub_dais_4514
ER  - 

@article{
author = "Uskoković, Vuk and Marković, Smilja and Veselinović, Ljiljana and Škapin, Srečo Davor and Ignjatović, Nenad and Uskoković, Dragan",
year = "2018",
abstract = "Transformations between amorphous and crystalline apatite mechanistically govern some of the most essential processes in bone metabolism, including biomineralization and bone remodeling. Fundamental understanding of this phase transition can help us gain control over the formation and dissolution of boney tissues in vivo and utilize that knowledge for various therapeutic ends. Crystallization of hydroxyapatite (HAp) and two tricalcium phosphate (TCP) polymorphs from the metastable precursor, amorphous calcium phosphate (ACP) was here studied kinetically and mechanistically using thermal analyses, X-ray diffraction and Fourier-transform infrared spectroscopy. Crystallization was detected in the differential thermal analysis as the exothermic peak at 639.5 °C at the slowest heating regimen of 5 °C min−1, while a combination of different kinetics models, including Augis–Bennett, Borchardt–Daniels, Johnson–Mehl–Avrami, Kissinger, Ozawa and Piloyan, yielded activation energies in the 435–450 kJ mol−1 range. Dehydrated ACP required a significant energy input to transform to HAp, thus indirectly proving the key role that structural water plays in this process in a biological setting. The phase transformation at high temperatures involved preformed nuclei and was solely due to their 3D growth, contrasting the edge-controlled nucleation derived earlier as the mechanism of growth in the solution. Crystallization was in both cases accompanied by the formation of needle-shape crystals of HAp through aggregation of ultrafine spherical units of ACP. Relationship between crystallinity and the heating rate was detected only for the initially amorphous structure, indicating a more intense and coherent lattice ordering process in annealed ACP than in HAp. Despite that, crystallization disobeyed the rule of inverse proportionality between the thermal energy required for the relaxation of defects and the level of strain, as the recovery rate of the initially poorly crystalline HAp was higher than that of ACP.",
publisher = "Royal Society of Chemistry (RSC)",
journal = "Physical Chemistry Chemical Physics",
title = "Insights into the kinetics of thermally induced crystallization of amorphous calcium phosphate",
pages = "29221-29235",
volume = "20",
doi = "10.1039/C8CP06460A",
url = "https://hdl.handle.net/21.15107/rcub_dais_4514"
}

Uskoković, V., Marković, S., Veselinović, L., Škapin, S. D., Ignjatović, N.,& Uskoković, D.. (2018). Insights into the kinetics of thermally induced crystallization of amorphous calcium phosphate. in Physical Chemistry Chemical Physics
Royal Society of Chemistry (RSC)., 20, 29221-29235.
https://doi.org/10.1039/C8CP06460A
https://hdl.handle.net/21.15107/rcub_dais_4514

Uskoković V, Marković S, Veselinović L, Škapin SD, Ignjatović N, Uskoković D. Insights into the kinetics of thermally induced crystallization of amorphous calcium phosphate. in Physical Chemistry Chemical Physics. 2018;20:29221-29235.
doi:10.1039/C8CP06460A
https://hdl.handle.net/21.15107/rcub_dais_4514 .

Uskoković, Vuk, Marković, Smilja, Veselinović, Ljiljana, Škapin, Srečo Davor, Ignjatović, Nenad, Uskoković, Dragan, "Insights into the kinetics of thermally induced crystallization of amorphous calcium phosphate" in Physical Chemistry Chemical Physics, 20 (2018):29221-29235,
https://doi.org/10.1039/C8CP06460A .,
https://hdl.handle.net/21.15107/rcub_dais_4514 .

TY  - JOUR
AU  - Uskoković, Vuk
AU  - Marković, Smilja
AU  - Veselinović, Ljiljana
AU  - Škapin, Srečo Davor
AU  - Ignjatović, Nenad
AU  - Uskoković, Dragan
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/4514
UR  - https://dais.sanu.ac.rs/123456789/4554
AB  - Transformations between amorphous and crystalline apatite mechanistically govern some of the most essential processes in bone metabolism, including biomineralization and bone remodeling. Fundamental understanding of this phase transition can help us gain control over the formation and dissolution of boney tissues in vivo and utilize that knowledge for various therapeutic ends. Crystallization of hydroxyapatite (HAp) and two tricalcium phosphate (TCP) polymorphs from the metastable precursor, amorphous calcium phosphate (ACP) was here studied kinetically and mechanistically using thermal analyses, X-ray diffraction and Fourier-transform infrared spectroscopy. Crystallization was detected in the differential thermal analysis as the exothermic peak at 639.5 °C at the slowest heating regimen of 5 °C min−1, while a combination of different kinetics models, including Augis–Bennett, Borchardt–Daniels, Johnson–Mehl–Avrami, Kissinger, Ozawa and Piloyan, yielded activation energies in the 435–450 kJ mol−1 range. Dehydrated ACP required a significant energy input to transform to HAp, thus indirectly proving the key role that structural water plays in this process in a biological setting. The phase transformation at high temperatures involved preformed nuclei and was solely due to their 3D growth, contrasting the edge-controlled nucleation derived earlier as the mechanism of growth in the solution. Crystallization was in both cases accompanied by the formation of needle-shape crystals of HAp through aggregation of ultrafine spherical units of ACP. Relationship between crystallinity and the heating rate was detected only for the initially amorphous structure, indicating a more intense and coherent lattice ordering process in annealed ACP than in HAp. Despite that, crystallization disobeyed the rule of inverse proportionality between the thermal energy required for the relaxation of defects and the level of strain, as the recovery rate of the initially poorly crystalline HAp was higher than that of ACP.
PB  - Royal Society of Chemistry (RSC)
T2  - Physical Chemistry Chemical Physics
T1  - Insights into the kinetics of thermally induced crystallization of amorphous calcium phosphate
SP  - 29221
EP  - 29235
VL  - 20
DO  - 10.1039/C8CP06460A
UR  - https://hdl.handle.net/21.15107/rcub_dais_4554
ER  - 

@article{
author = "Uskoković, Vuk and Marković, Smilja and Veselinović, Ljiljana and Škapin, Srečo Davor and Ignjatović, Nenad and Uskoković, Dragan",
year = "2018",
abstract = "Transformations between amorphous and crystalline apatite mechanistically govern some of the most essential processes in bone metabolism, including biomineralization and bone remodeling. Fundamental understanding of this phase transition can help us gain control over the formation and dissolution of boney tissues in vivo and utilize that knowledge for various therapeutic ends. Crystallization of hydroxyapatite (HAp) and two tricalcium phosphate (TCP) polymorphs from the metastable precursor, amorphous calcium phosphate (ACP) was here studied kinetically and mechanistically using thermal analyses, X-ray diffraction and Fourier-transform infrared spectroscopy. Crystallization was detected in the differential thermal analysis as the exothermic peak at 639.5 °C at the slowest heating regimen of 5 °C min−1, while a combination of different kinetics models, including Augis–Bennett, Borchardt–Daniels, Johnson–Mehl–Avrami, Kissinger, Ozawa and Piloyan, yielded activation energies in the 435–450 kJ mol−1 range. Dehydrated ACP required a significant energy input to transform to HAp, thus indirectly proving the key role that structural water plays in this process in a biological setting. The phase transformation at high temperatures involved preformed nuclei and was solely due to their 3D growth, contrasting the edge-controlled nucleation derived earlier as the mechanism of growth in the solution. Crystallization was in both cases accompanied by the formation of needle-shape crystals of HAp through aggregation of ultrafine spherical units of ACP. Relationship between crystallinity and the heating rate was detected only for the initially amorphous structure, indicating a more intense and coherent lattice ordering process in annealed ACP than in HAp. Despite that, crystallization disobeyed the rule of inverse proportionality between the thermal energy required for the relaxation of defects and the level of strain, as the recovery rate of the initially poorly crystalline HAp was higher than that of ACP.",
publisher = "Royal Society of Chemistry (RSC)",
journal = "Physical Chemistry Chemical Physics",
title = "Insights into the kinetics of thermally induced crystallization of amorphous calcium phosphate",
pages = "29221-29235",
volume = "20",
doi = "10.1039/C8CP06460A",
url = "https://hdl.handle.net/21.15107/rcub_dais_4554"
}

Uskoković, V., Marković, S., Veselinović, L., Škapin, S. D., Ignjatović, N.,& Uskoković, D.. (2018). Insights into the kinetics of thermally induced crystallization of amorphous calcium phosphate. in Physical Chemistry Chemical Physics
Royal Society of Chemistry (RSC)., 20, 29221-29235.
https://doi.org/10.1039/C8CP06460A
https://hdl.handle.net/21.15107/rcub_dais_4554

Uskoković V, Marković S, Veselinović L, Škapin SD, Ignjatović N, Uskoković D. Insights into the kinetics of thermally induced crystallization of amorphous calcium phosphate. in Physical Chemistry Chemical Physics. 2018;20:29221-29235.
doi:10.1039/C8CP06460A
https://hdl.handle.net/21.15107/rcub_dais_4554 .

Uskoković, Vuk, Marković, Smilja, Veselinović, Ljiljana, Škapin, Srečo Davor, Ignjatović, Nenad, Uskoković, Dragan, "Insights into the kinetics of thermally induced crystallization of amorphous calcium phosphate" in Physical Chemistry Chemical Physics, 20 (2018):29221-29235,
https://doi.org/10.1039/C8CP06460A .,
https://hdl.handle.net/21.15107/rcub_dais_4554 .

TY  - JOUR
AU  - Ignjatović, Nenad
AU  - Penov Gaši, Katarina
AU  - Wu, Victoria
AU  - Ajduković, Jovana
AU  - Kojić, Vesna V.
AU  - Vasiljević Radović, Dana
AU  - Kuzmanović, Maja
AU  - Uskoković, Vuk
AU  - Uskoković, Dragan
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/15974
AB  - In an earlier study we demonstrated that hydroxyapatite nanoparticles coated with chitosan-poly(d,l)-lactide-co-glycolide (HAp/Ch-PLGA) target lungs following their intravenous injection into mice. In this study we utilize an emulsification process and freeze drying to load the composite HAp/Ch-PLGA particles with 17β-hydroxy-17α-picolyl-androst-5-en-3β-yl-acetate (A), a chemotherapeutic derivative of androstane and a novel compound with a selective anticancer activity against lung cancer cells. 1H NMR and 13C NMR techniques confirmed the intact structure of the derivative A following its entrapment within HAp/Ch-PLGA particles. The thermogravimetric and differential thermal analyses coupled with mass spectrometry were used to assess the thermal degradation products and properties of A-loaded HAp/Ch-PLGA. The loading efficiency, as indicated by the comparison of enthalpies of phase transitions in pure A and A-loaded HAp/Ch-PLGA, equaled 7.47wt.%. The release of A from HAp/Ch-PLGA was sustained, neither exhibiting a burst release nor plateauing after three weeks. Atomic force microscopy and particle size distribution analyses were used to confirm that the particles were spherical with a uniform size distribution of d50=168nm. In vitro cytotoxicity testing of A-loaded HAp/Ch-PLGA using MTT and trypan blue dye exclusion assays demonstrated that the particles were cytotoxic to the A549 human lung carcinoma cell line (46±2%), while simultaneously preserving high viability (83±3%) of regular MRC5 human lung fibroblasts and causing no harm to primary mouse lung fibroblasts. In conclusion, composite A-loaded HAp/Ch-PLGA particles could be seen as promising drug delivery platforms for selective cancer therapies, targeting malignant cells for destruction, while having a significantly lesser cytotoxic effect on the healthy cells.
PB  - Elsevier
T2  - Colloids and Surfaces B: Biointerfaces
T1  - Selective anticancer activity of hydroxyapatite/chitosan-poly(d,l)-lactide-co-glycolide particles loaded with an androstane-based cancer inhibitor
SP  - 629
EP  - 639
VL  - 148
DO  - 10.1016/j.colsurfb.2016.09.041
UR  - https://hdl.handle.net/21.15107/rcub_dais_15974
ER  - 

@article{
author = "Ignjatović, Nenad and Penov Gaši, Katarina and Wu, Victoria and Ajduković, Jovana and Kojić, Vesna V. and Vasiljević Radović, Dana and Kuzmanović, Maja and Uskoković, Vuk and Uskoković, Dragan",
year = "2016",
abstract = "In an earlier study we demonstrated that hydroxyapatite nanoparticles coated with chitosan-poly(d,l)-lactide-co-glycolide (HAp/Ch-PLGA) target lungs following their intravenous injection into mice. In this study we utilize an emulsification process and freeze drying to load the composite HAp/Ch-PLGA particles with 17β-hydroxy-17α-picolyl-androst-5-en-3β-yl-acetate (A), a chemotherapeutic derivative of androstane and a novel compound with a selective anticancer activity against lung cancer cells. 1H NMR and 13C NMR techniques confirmed the intact structure of the derivative A following its entrapment within HAp/Ch-PLGA particles. The thermogravimetric and differential thermal analyses coupled with mass spectrometry were used to assess the thermal degradation products and properties of A-loaded HAp/Ch-PLGA. The loading efficiency, as indicated by the comparison of enthalpies of phase transitions in pure A and A-loaded HAp/Ch-PLGA, equaled 7.47wt.%. The release of A from HAp/Ch-PLGA was sustained, neither exhibiting a burst release nor plateauing after three weeks. Atomic force microscopy and particle size distribution analyses were used to confirm that the particles were spherical with a uniform size distribution of d50=168nm. In vitro cytotoxicity testing of A-loaded HAp/Ch-PLGA using MTT and trypan blue dye exclusion assays demonstrated that the particles were cytotoxic to the A549 human lung carcinoma cell line (46±2%), while simultaneously preserving high viability (83±3%) of regular MRC5 human lung fibroblasts and causing no harm to primary mouse lung fibroblasts. In conclusion, composite A-loaded HAp/Ch-PLGA particles could be seen as promising drug delivery platforms for selective cancer therapies, targeting malignant cells for destruction, while having a significantly lesser cytotoxic effect on the healthy cells.",
publisher = "Elsevier",
journal = "Colloids and Surfaces B: Biointerfaces",
title = "Selective anticancer activity of hydroxyapatite/chitosan-poly(d,l)-lactide-co-glycolide particles loaded with an androstane-based cancer inhibitor",
pages = "629-639",
volume = "148",
doi = "10.1016/j.colsurfb.2016.09.041",
url = "https://hdl.handle.net/21.15107/rcub_dais_15974"
}

Ignjatović, N., Penov Gaši, K., Wu, V., Ajduković, J., Kojić, V. V., Vasiljević Radović, D., Kuzmanović, M., Uskoković, V.,& Uskoković, D.. (2016). Selective anticancer activity of hydroxyapatite/chitosan-poly(d,l)-lactide-co-glycolide particles loaded with an androstane-based cancer inhibitor. in Colloids and Surfaces B: Biointerfaces
Elsevier., 148, 629-639.
https://doi.org/10.1016/j.colsurfb.2016.09.041
https://hdl.handle.net/21.15107/rcub_dais_15974

Ignjatović N, Penov Gaši K, Wu V, Ajduković J, Kojić VV, Vasiljević Radović D, Kuzmanović M, Uskoković V, Uskoković D. Selective anticancer activity of hydroxyapatite/chitosan-poly(d,l)-lactide-co-glycolide particles loaded with an androstane-based cancer inhibitor. in Colloids and Surfaces B: Biointerfaces. 2016;148:629-639.
doi:10.1016/j.colsurfb.2016.09.041
https://hdl.handle.net/21.15107/rcub_dais_15974 .

Ignjatović, Nenad, Penov Gaši, Katarina, Wu, Victoria, Ajduković, Jovana, Kojić, Vesna V., Vasiljević Radović, Dana, Kuzmanović, Maja, Uskoković, Vuk, Uskoković, Dragan, "Selective anticancer activity of hydroxyapatite/chitosan-poly(d,l)-lactide-co-glycolide particles loaded with an androstane-based cancer inhibitor" in Colloids and Surfaces B: Biointerfaces, 148 (2016):629-639,
https://doi.org/10.1016/j.colsurfb.2016.09.041 .,
https://hdl.handle.net/21.15107/rcub_dais_15974 .

TY  - JOUR
AU  - Ignjatović, Nenad
AU  - Penov Gaši, Katarina
AU  - Wu, Victoria
AU  - Ajduković, Jovana
AU  - Kojić, Vesna
AU  - Vasiljević Radović, Dana
AU  - Kuzmanović, Maja
AU  - Uskoković, Vuk
AU  - Uskoković, Dragan
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/15984
AB  - In an earlier study we demonstrated that hydroxyapatite nanoparticles coated with chitosan-poly(d,l)-lactide-co-glycolide (HAp/Ch-PLGA) target lungs following their intravenous injection into mice. In this study we utilize an emulsification process and freeze drying to load the composite HAp/Ch-PLGA particles with 17β-hydroxy-17α-picolyl-androst-5-en-3β-yl-acetate (A), a chemotherapeutic derivative of androstane and a novel compound with a selective anticancer activity against lung cancer cells. 1H NMR and 13C NMR techniques confirmed the intact structure of the derivative A following its entrapment within HAp/Ch-PLGA particles. The thermogravimetric and differential thermal analyses coupled with mass spectrometry were used to assess the thermal degradation products and properties of A-loaded HAp/Ch-PLGA. The loading efficiency, as indicated by the comparison of enthalpies of phase transitions in pure A and A-loaded HAp/Ch-PLGA, equaled 7.47 wt.%. The release of A from HAp/Ch-PLGA was sustained, neither exhibiting a burst release nor plateauing after three weeks. Atomic force microscopy and particle size distribution analyses were used to confirm that the particles were spherical with a uniform size distribution of d50 = 168 nm. In vitro cytotoxicity testing of A-loaded HAp/Ch-PLGA using MTT and trypan blue dye exclusion assays demonstrated that the particles were cytotoxic to the A549 human lung carcinoma cell line (46 ± 2%), while simultaneously preserving high viability (83 ± 3%) of regular MRC5 human lung fibroblasts and causing no harm to primary mouse lung fibroblasts. In conclusion, composite A-loaded HAp/Ch-PLGA particles could be seen as promising drug delivery platforms for selective cancer therapies, targeting malignant cells for destruction, while having a significantly lesser cytotoxic effect on the healthy cells.
T2  - Colloids and Surfaces B: Biointerfaces
T1  - Selective anticancer activity of hydroxyapatite/chitosan-poly(D,L)-lactide-co-glycolide particles loaded with an androstane-based cancer inhibitor
SP  - 629
EP  - 639
VL  - 148
DO  - 10.1016/j.colsurfb.2016.09.041
UR  - https://hdl.handle.net/21.15107/rcub_dais_15984
ER  - 

@article{
author = "Ignjatović, Nenad and Penov Gaši, Katarina and Wu, Victoria and Ajduković, Jovana and Kojić, Vesna and Vasiljević Radović, Dana and Kuzmanović, Maja and Uskoković, Vuk and Uskoković, Dragan",
year = "2016",
abstract = "In an earlier study we demonstrated that hydroxyapatite nanoparticles coated with chitosan-poly(d,l)-lactide-co-glycolide (HAp/Ch-PLGA) target lungs following their intravenous injection into mice. In this study we utilize an emulsification process and freeze drying to load the composite HAp/Ch-PLGA particles with 17β-hydroxy-17α-picolyl-androst-5-en-3β-yl-acetate (A), a chemotherapeutic derivative of androstane and a novel compound with a selective anticancer activity against lung cancer cells. 1H NMR and 13C NMR techniques confirmed the intact structure of the derivative A following its entrapment within HAp/Ch-PLGA particles. The thermogravimetric and differential thermal analyses coupled with mass spectrometry were used to assess the thermal degradation products and properties of A-loaded HAp/Ch-PLGA. The loading efficiency, as indicated by the comparison of enthalpies of phase transitions in pure A and A-loaded HAp/Ch-PLGA, equaled 7.47 wt.%. The release of A from HAp/Ch-PLGA was sustained, neither exhibiting a burst release nor plateauing after three weeks. Atomic force microscopy and particle size distribution analyses were used to confirm that the particles were spherical with a uniform size distribution of d50 = 168 nm. In vitro cytotoxicity testing of A-loaded HAp/Ch-PLGA using MTT and trypan blue dye exclusion assays demonstrated that the particles were cytotoxic to the A549 human lung carcinoma cell line (46 ± 2%), while simultaneously preserving high viability (83 ± 3%) of regular MRC5 human lung fibroblasts and causing no harm to primary mouse lung fibroblasts. In conclusion, composite A-loaded HAp/Ch-PLGA particles could be seen as promising drug delivery platforms for selective cancer therapies, targeting malignant cells for destruction, while having a significantly lesser cytotoxic effect on the healthy cells.",
journal = "Colloids and Surfaces B: Biointerfaces",
title = "Selective anticancer activity of hydroxyapatite/chitosan-poly(D,L)-lactide-co-glycolide particles loaded with an androstane-based cancer inhibitor",
pages = "629-639",
volume = "148",
doi = "10.1016/j.colsurfb.2016.09.041",
url = "https://hdl.handle.net/21.15107/rcub_dais_15984"
}

Ignjatović, N., Penov Gaši, K., Wu, V., Ajduković, J., Kojić, V., Vasiljević Radović, D., Kuzmanović, M., Uskoković, V.,& Uskoković, D.. (2016). Selective anticancer activity of hydroxyapatite/chitosan-poly(D,L)-lactide-co-glycolide particles loaded with an androstane-based cancer inhibitor. in Colloids and Surfaces B: Biointerfaces, 148, 629-639.
https://doi.org/10.1016/j.colsurfb.2016.09.041
https://hdl.handle.net/21.15107/rcub_dais_15984

Ignjatović N, Penov Gaši K, Wu V, Ajduković J, Kojić V, Vasiljević Radović D, Kuzmanović M, Uskoković V, Uskoković D. Selective anticancer activity of hydroxyapatite/chitosan-poly(D,L)-lactide-co-glycolide particles loaded with an androstane-based cancer inhibitor. in Colloids and Surfaces B: Biointerfaces. 2016;148:629-639.
doi:10.1016/j.colsurfb.2016.09.041
https://hdl.handle.net/21.15107/rcub_dais_15984 .

Ignjatović, Nenad, Penov Gaši, Katarina, Wu, Victoria, Ajduković, Jovana, Kojić, Vesna, Vasiljević Radović, Dana, Kuzmanović, Maja, Uskoković, Vuk, Uskoković, Dragan, "Selective anticancer activity of hydroxyapatite/chitosan-poly(D,L)-lactide-co-glycolide particles loaded with an androstane-based cancer inhibitor" in Colloids and Surfaces B: Biointerfaces, 148 (2016):629-639,
https://doi.org/10.1016/j.colsurfb.2016.09.041 .,
https://hdl.handle.net/21.15107/rcub_dais_15984 .

TY  - JOUR
AU  - Ignjatović, Nenad
AU  - Wu, Victoria
AU  - Ajduković, Zorica
AU  - Mihajilov Krstev, Tatjana
AU  - Uskoković, Vuk
AU  - Uskoković, Dragan
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/15983
AB  - Composite biomaterials comprising nanostructured hydroxyapatite (HAp) have an enormous potential for natural bone tissue reparation, filling and augmentation. Chitosan (Ch) as a naturally derived polymer has many physicochemical and biological properties that make it an attractive material for use in bone tissue engineering. On the other hand, poly-D,L-lactide-co-glycolide (PLGA) is a synthetic polymer with a long history of use in sustained drug delivery and tissue engineering. However, while chitosan can disrupt the cell membrane integrity and may induce blood thrombosis, PLGA releases acidic byproducts that may cause tissue inflammation and interfere with the healing process. One of the strategies to improve the biocompatibility of Ch and PLGA is to combine them with compounds that exhibit complementary properties. In this study we present the synthesis and characterization, as well as in vitro and in vivo analyses of a nanoparticulate form of HAp coated with two different polymeric systems: (a) Ch and (b) a Ch-PLGA polymer blend. Solvent/non-solvent precipitation and freeze-drying were used for synthesis and processing, respectively, whereas thermogravimetry coupled with mass spectrometry was used for phase identification purposes in the coating process. HAp/Ch composite particles exhibited the highest antimicrobial activity against all four microbial strains tested in this work, but after the reconstruction of the bone defect they also caused inflammatory reactions in the newly formed tissue where the defect had lain. Coating HAp with a polymeric blend composed of Ch and PLGA led to a decrease in the reactivity and antimicrobial activity of the composite particles, but also to an increase in the quality of the newly formed bone tissue in the reconstructed defect area.
T2  - Materials science & engineering. C, Materials for biological applications
T1  - Chitosan-PLGA polymer blends as coatings for hydroxyapatite nanoparticles and their effect on antimicrobial properties, osteoconductivity and regeneration of osseous tissues
SP  - 357
EP  - 364
VL  - 60
DO  - 10.1016/j.msec.2015.11.061
UR  - https://hdl.handle.net/21.15107/rcub_dais_15983
ER  - 

@article{
author = "Ignjatović, Nenad and Wu, Victoria and Ajduković, Zorica and Mihajilov Krstev, Tatjana and Uskoković, Vuk and Uskoković, Dragan",
year = "2016",
abstract = "Composite biomaterials comprising nanostructured hydroxyapatite (HAp) have an enormous potential for natural bone tissue reparation, filling and augmentation. Chitosan (Ch) as a naturally derived polymer has many physicochemical and biological properties that make it an attractive material for use in bone tissue engineering. On the other hand, poly-D,L-lactide-co-glycolide (PLGA) is a synthetic polymer with a long history of use in sustained drug delivery and tissue engineering. However, while chitosan can disrupt the cell membrane integrity and may induce blood thrombosis, PLGA releases acidic byproducts that may cause tissue inflammation and interfere with the healing process. One of the strategies to improve the biocompatibility of Ch and PLGA is to combine them with compounds that exhibit complementary properties. In this study we present the synthesis and characterization, as well as in vitro and in vivo analyses of a nanoparticulate form of HAp coated with two different polymeric systems: (a) Ch and (b) a Ch-PLGA polymer blend. Solvent/non-solvent precipitation and freeze-drying were used for synthesis and processing, respectively, whereas thermogravimetry coupled with mass spectrometry was used for phase identification purposes in the coating process. HAp/Ch composite particles exhibited the highest antimicrobial activity against all four microbial strains tested in this work, but after the reconstruction of the bone defect they also caused inflammatory reactions in the newly formed tissue where the defect had lain. Coating HAp with a polymeric blend composed of Ch and PLGA led to a decrease in the reactivity and antimicrobial activity of the composite particles, but also to an increase in the quality of the newly formed bone tissue in the reconstructed defect area.",
journal = "Materials science & engineering. C, Materials for biological applications",
title = "Chitosan-PLGA polymer blends as coatings for hydroxyapatite nanoparticles and their effect on antimicrobial properties, osteoconductivity and regeneration of osseous tissues",
pages = "357-364",
volume = "60",
doi = "10.1016/j.msec.2015.11.061",
url = "https://hdl.handle.net/21.15107/rcub_dais_15983"
}

Ignjatović, N., Wu, V., Ajduković, Z., Mihajilov Krstev, T., Uskoković, V.,& Uskoković, D.. (2016). Chitosan-PLGA polymer blends as coatings for hydroxyapatite nanoparticles and their effect on antimicrobial properties, osteoconductivity and regeneration of osseous tissues. in Materials science & engineering. C, Materials for biological applications, 60, 357-364.
https://doi.org/10.1016/j.msec.2015.11.061
https://hdl.handle.net/21.15107/rcub_dais_15983

Ignjatović N, Wu V, Ajduković Z, Mihajilov Krstev T, Uskoković V, Uskoković D. Chitosan-PLGA polymer blends as coatings for hydroxyapatite nanoparticles and their effect on antimicrobial properties, osteoconductivity and regeneration of osseous tissues. in Materials science & engineering. C, Materials for biological applications. 2016;60:357-364.
doi:10.1016/j.msec.2015.11.061
https://hdl.handle.net/21.15107/rcub_dais_15983 .

Ignjatović, Nenad, Wu, Victoria, Ajduković, Zorica, Mihajilov Krstev, Tatjana, Uskoković, Vuk, Uskoković, Dragan, "Chitosan-PLGA polymer blends as coatings for hydroxyapatite nanoparticles and their effect on antimicrobial properties, osteoconductivity and regeneration of osseous tissues" in Materials science & engineering. C, Materials for biological applications, 60 (2016):357-364,
https://doi.org/10.1016/j.msec.2015.11.061 .,
https://hdl.handle.net/21.15107/rcub_dais_15983 .

TY  - JOUR
AU  - Ignjatović, Nenad
AU  - Wu, Victoria
AU  - Ajduković, Zorica
AU  - Mihajilov Krstev, Tatjana
AU  - Uskoković, Vuk
AU  - Uskoković, Dragan
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/15975
AB  - Composite biomaterials comprising nanostructured hydroxyapatite (HAp) have an enormous potential for natural bone tissue reparation, filling and augmentation. Chitosan (Ch) as a naturally derived polymer has many physicochemical and biological properties that make it an attractive material for use in bone tissue engineering. On the other hand, poly-D,L-lactide-co-glycolide (PLGA) is a synthetic polymer with a long history of use in sustained drug delivery and tissue engineering. However, while chitosan can disrupt the cell membrane integrity and may induce blood thrombosis, PLGA releases acidic byproducts that may cause tissue inflammation and interfere with the healing process. One of the strategies to improve the biocompatibility of Ch and PLGA is to combine them with compounds that exhibit complementary properties. In this study we present the synthesis and characterization, as well as in vitro and in vivo analyses of a nanoparticulate form of HAp coated with two different polymeric systems: (a) Ch and (b) a Ch-PLGA polymer blend. Solvent/non-solvent precipitation and freeze-drying were used for synthesis and processing, respectively, whereas thermogravimetry coupled with mass spectrometry was used for phase identification purposes in the coating process. HAp/Ch composite particles exhibited the highest antimicrobial activity against all four microbial strains tested in this work, but after the reconstruction of the bone defect they also caused inflammatory reactions in the newly formed tissue where the defect had lain. Coating HAp with a polymeric blend composed of Ch and PLGA led to a decrease in the reactivity and antimicrobial activity of the composite particles, but also to an increase in the quality of the newly formed bone tissue in the reconstructed defect area.
PB  - Elsevier
T2  - Materials Science and Engineering C
T1  - Chitosan-PLGA polymer blends as coatings for hydroxyapatite nanoparticles and their effect on antimicrobial properties, osteoconductivity and regeneration of osseous tissues
SP  - 357
EP  - 364
VL  - 60
DO  - 10.1016/j.msec.2015.11.061
UR  - https://hdl.handle.net/21.15107/rcub_dais_15975
ER  - 

@article{
author = "Ignjatović, Nenad and Wu, Victoria and Ajduković, Zorica and Mihajilov Krstev, Tatjana and Uskoković, Vuk and Uskoković, Dragan",
year = "2016",
abstract = "Composite biomaterials comprising nanostructured hydroxyapatite (HAp) have an enormous potential for natural bone tissue reparation, filling and augmentation. Chitosan (Ch) as a naturally derived polymer has many physicochemical and biological properties that make it an attractive material for use in bone tissue engineering. On the other hand, poly-D,L-lactide-co-glycolide (PLGA) is a synthetic polymer with a long history of use in sustained drug delivery and tissue engineering. However, while chitosan can disrupt the cell membrane integrity and may induce blood thrombosis, PLGA releases acidic byproducts that may cause tissue inflammation and interfere with the healing process. One of the strategies to improve the biocompatibility of Ch and PLGA is to combine them with compounds that exhibit complementary properties. In this study we present the synthesis and characterization, as well as in vitro and in vivo analyses of a nanoparticulate form of HAp coated with two different polymeric systems: (a) Ch and (b) a Ch-PLGA polymer blend. Solvent/non-solvent precipitation and freeze-drying were used for synthesis and processing, respectively, whereas thermogravimetry coupled with mass spectrometry was used for phase identification purposes in the coating process. HAp/Ch composite particles exhibited the highest antimicrobial activity against all four microbial strains tested in this work, but after the reconstruction of the bone defect they also caused inflammatory reactions in the newly formed tissue where the defect had lain. Coating HAp with a polymeric blend composed of Ch and PLGA led to a decrease in the reactivity and antimicrobial activity of the composite particles, but also to an increase in the quality of the newly formed bone tissue in the reconstructed defect area.",
publisher = "Elsevier",
journal = "Materials Science and Engineering C",
title = "Chitosan-PLGA polymer blends as coatings for hydroxyapatite nanoparticles and their effect on antimicrobial properties, osteoconductivity and regeneration of osseous tissues",
pages = "357-364",
volume = "60",
doi = "10.1016/j.msec.2015.11.061",
url = "https://hdl.handle.net/21.15107/rcub_dais_15975"
}

Ignjatović, N., Wu, V., Ajduković, Z., Mihajilov Krstev, T., Uskoković, V.,& Uskoković, D.. (2016). Chitosan-PLGA polymer blends as coatings for hydroxyapatite nanoparticles and their effect on antimicrobial properties, osteoconductivity and regeneration of osseous tissues. in Materials Science and Engineering C
Elsevier., 60, 357-364.
https://doi.org/10.1016/j.msec.2015.11.061
https://hdl.handle.net/21.15107/rcub_dais_15975

Ignjatović N, Wu V, Ajduković Z, Mihajilov Krstev T, Uskoković V, Uskoković D. Chitosan-PLGA polymer blends as coatings for hydroxyapatite nanoparticles and their effect on antimicrobial properties, osteoconductivity and regeneration of osseous tissues. in Materials Science and Engineering C. 2016;60:357-364.
doi:10.1016/j.msec.2015.11.061
https://hdl.handle.net/21.15107/rcub_dais_15975 .

Ignjatović, Nenad, Wu, Victoria, Ajduković, Zorica, Mihajilov Krstev, Tatjana, Uskoković, Vuk, Uskoković, Dragan, "Chitosan-PLGA polymer blends as coatings for hydroxyapatite nanoparticles and their effect on antimicrobial properties, osteoconductivity and regeneration of osseous tissues" in Materials Science and Engineering C, 60 (2016):357-364,
https://doi.org/10.1016/j.msec.2015.11.061 .,
https://hdl.handle.net/21.15107/rcub_dais_15975 .

TY  - JOUR
AU  - Stojanović, Zoran S.
AU  - Ignjatović, Nenad
AU  - Wu, Victoria
AU  - Žunič, Vojka
AU  - Veselinović, Ljiljana
AU  - Škapin, Srečo Davor
AU  - Miljković, Miroslav
AU  - Uskoković, Vuk
AU  - Uskoković, Dragan
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/16006
AB  - Recent developments in bone tissue engineering have led to an increased interest in one-dimensional (1D) hydroxyapatite (HA) nano- and micro-structures such as wires, ribbons and tubes. They have been proposed for use as cell substrates, reinforcing phases in composites and carriers for biologically active substances. Here we demonstrate the synthesis of 1D HA structures using an optimized, urea-assisted, high-yield hydrothermal batch process. The one-pot process, yielding HA structures composed of bundles of ribbons and wires, was typified by the simultaneous occurrence of a multitude of intermediate reactions, failing to meet the uniformity criteria over particle morphology and size. To overcome these issues, the preparation procedure was divided to two stages: dicalcium phosphate platelets synthesized in the first step were used as a precursor for the synthesis of 1D HA in the second stage. Despite the elongated particle morphologies, both the precursor and the final product exhibited excellent biocompatibility and caused no reduction of viability when tested against osteoblastic MC3T3-E1 cells in 2D culture up to the concentration of 2.6 mg/cm2. X-ray powder diffraction combined with a range of electron microscopies and laser diffraction analyses was used to elucidate the formation mechanism and the microstructure of the final particles. The two-step synthesis involved a more direct transformation of DCP to 1D HA with the average diameter of 37 nm and the aspect ratio exceeding 100:1. The comparison of crystalline domain sizes along different crystallographic directions showed no signs of significant anisotropy, while indicating that individual nanowires are ordered in bundles in the b crystallographic direction of the P63/m space group of HA. Intermediate processes, e.g., dehydration of dicalcium phosphate, are critical for the formation of 1D HA alongside other key aspects of this phase transformation, it must be investigated in more detail in the continuous design of smart HA micro- and nano-structures with advanced therapeutic potentials.
PB  - Elsevier
T2  - Materials Science and Engineering: C
T1  - Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies
SP  - 746
EP  - 757
VL  - 68
DO  - 10.1016/j.msec.2016.06.047
UR  - https://hdl.handle.net/21.15107/rcub_dais_16006
ER  - 

@article{
author = "Stojanović, Zoran S. and Ignjatović, Nenad and Wu, Victoria and Žunič, Vojka and Veselinović, Ljiljana and Škapin, Srečo Davor and Miljković, Miroslav and Uskoković, Vuk and Uskoković, Dragan",
year = "2016",
abstract = "Recent developments in bone tissue engineering have led to an increased interest in one-dimensional (1D) hydroxyapatite (HA) nano- and micro-structures such as wires, ribbons and tubes. They have been proposed for use as cell substrates, reinforcing phases in composites and carriers for biologically active substances. Here we demonstrate the synthesis of 1D HA structures using an optimized, urea-assisted, high-yield hydrothermal batch process. The one-pot process, yielding HA structures composed of bundles of ribbons and wires, was typified by the simultaneous occurrence of a multitude of intermediate reactions, failing to meet the uniformity criteria over particle morphology and size. To overcome these issues, the preparation procedure was divided to two stages: dicalcium phosphate platelets synthesized in the first step were used as a precursor for the synthesis of 1D HA in the second stage. Despite the elongated particle morphologies, both the precursor and the final product exhibited excellent biocompatibility and caused no reduction of viability when tested against osteoblastic MC3T3-E1 cells in 2D culture up to the concentration of 2.6 mg/cm2. X-ray powder diffraction combined with a range of electron microscopies and laser diffraction analyses was used to elucidate the formation mechanism and the microstructure of the final particles. The two-step synthesis involved a more direct transformation of DCP to 1D HA with the average diameter of 37 nm and the aspect ratio exceeding 100:1. The comparison of crystalline domain sizes along different crystallographic directions showed no signs of significant anisotropy, while indicating that individual nanowires are ordered in bundles in the b crystallographic direction of the P63/m space group of HA. Intermediate processes, e.g., dehydration of dicalcium phosphate, are critical for the formation of 1D HA alongside other key aspects of this phase transformation, it must be investigated in more detail in the continuous design of smart HA micro- and nano-structures with advanced therapeutic potentials.",
publisher = "Elsevier",
journal = "Materials Science and Engineering: C",
title = "Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies",
pages = "746-757",
volume = "68",
doi = "10.1016/j.msec.2016.06.047",
url = "https://hdl.handle.net/21.15107/rcub_dais_16006"
}

Stojanović, Z. S., Ignjatović, N., Wu, V., Žunič, V., Veselinović, L., Škapin, S. D., Miljković, M., Uskoković, V.,& Uskoković, D.. (2016). Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies. in Materials Science and Engineering: C
Elsevier., 68, 746-757.
https://doi.org/10.1016/j.msec.2016.06.047
https://hdl.handle.net/21.15107/rcub_dais_16006

Stojanović ZS, Ignjatović N, Wu V, Žunič V, Veselinović L, Škapin SD, Miljković M, Uskoković V, Uskoković D. Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies. in Materials Science and Engineering: C. 2016;68:746-757.
doi:10.1016/j.msec.2016.06.047
https://hdl.handle.net/21.15107/rcub_dais_16006 .

Stojanović, Zoran S., Ignjatović, Nenad, Wu, Victoria, Žunič, Vojka, Veselinović, Ljiljana, Škapin, Srečo Davor, Miljković, Miroslav, Uskoković, Vuk, Uskoković, Dragan, "Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies" in Materials Science and Engineering: C, 68 (2016):746-757,
https://doi.org/10.1016/j.msec.2016.06.047 .,
https://hdl.handle.net/21.15107/rcub_dais_16006 .

TY  - JOUR
AU  - Stojanović, Zoran S.
AU  - Ignjatović, Nenad
AU  - Wu, Victoria
AU  - Žunič, Vojka
AU  - Veselinović, Ljiljana
AU  - Škapin, Srečo Davor
AU  - Miljković, Miroslav
AU  - Uskoković, Vuk
AU  - Uskoković, Dragan
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/15985
AB  - Recent developments in bone tissue engineering have led to an increased interest in one-dimensional (1D) hydroxyapatite (HA) nano- and micro-structures such as wires, ribbons and tubes. They have been proposed for use as cell substrates, reinforcing phases in composites and carriers for biologically active substances. Here we demonstrate the synthesis of 1D HA structures using an optimized, urea-assisted, high-yield hydrothermal batch process. The one-pot process, yielding HA structures composed of bundles of ribbons and wires, was typified by the simultaneous occurrence of a multitude of intermediate reactions, failing to meet the uniformity criteria over particle morphology and size. To overcome these issues, the preparation procedure was divided to two stages: dicalcium phosphate platelets synthesized in the first step were used as a precursor for the synthesis of 1D HA in the second stage. Despite the elongated particle morphologies, both the precursor and the final product exhibited excellent biocompatibility and caused no reduction of viability when tested against osteoblastic MC3T3-E1 cells in 2D culture up to the concentration of 2.6 mg/cm2. X-ray powder diffraction combined with a range of electron microscopies and laser diffraction analyses was used to elucidate the formation mechanism and the microstructure of the final particles. The two-step synthesis involved a more direct transformation of DCP to 1D HA with the average diameter of 37 nm and the aspect ratio exceeding 100:1. The comparison of crystalline domain sizes along different crystallographic directions showed no signs of significant anisotropy, while indicating that individual nanowires are ordered in bundles in the b crystallographic direction of the P63/m space group of HA. Intermediate processes, e.g., dehydration of dicalcium phosphate, are critical for the formation of 1D HA alongside other key aspects of this phase transformation, it must be investigated in more detail in the continuous design of smart HA micro- and nano-structures with advanced therapeutic potentials.
T2  - Materials Science and Engineering: C
T1  - Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies
SP  - 746
EP  - 757
VL  - 68
DO  - 10.1016/j.msec.2016.06.047
UR  - https://hdl.handle.net/21.15107/rcub_dais_15985
ER  - 

@article{
author = "Stojanović, Zoran S. and Ignjatović, Nenad and Wu, Victoria and Žunič, Vojka and Veselinović, Ljiljana and Škapin, Srečo Davor and Miljković, Miroslav and Uskoković, Vuk and Uskoković, Dragan",
year = "2016",
abstract = "Recent developments in bone tissue engineering have led to an increased interest in one-dimensional (1D) hydroxyapatite (HA) nano- and micro-structures such as wires, ribbons and tubes. They have been proposed for use as cell substrates, reinforcing phases in composites and carriers for biologically active substances. Here we demonstrate the synthesis of 1D HA structures using an optimized, urea-assisted, high-yield hydrothermal batch process. The one-pot process, yielding HA structures composed of bundles of ribbons and wires, was typified by the simultaneous occurrence of a multitude of intermediate reactions, failing to meet the uniformity criteria over particle morphology and size. To overcome these issues, the preparation procedure was divided to two stages: dicalcium phosphate platelets synthesized in the first step were used as a precursor for the synthesis of 1D HA in the second stage. Despite the elongated particle morphologies, both the precursor and the final product exhibited excellent biocompatibility and caused no reduction of viability when tested against osteoblastic MC3T3-E1 cells in 2D culture up to the concentration of 2.6 mg/cm2. X-ray powder diffraction combined with a range of electron microscopies and laser diffraction analyses was used to elucidate the formation mechanism and the microstructure of the final particles. The two-step synthesis involved a more direct transformation of DCP to 1D HA with the average diameter of 37 nm and the aspect ratio exceeding 100:1. The comparison of crystalline domain sizes along different crystallographic directions showed no signs of significant anisotropy, while indicating that individual nanowires are ordered in bundles in the b crystallographic direction of the P63/m space group of HA. Intermediate processes, e.g., dehydration of dicalcium phosphate, are critical for the formation of 1D HA alongside other key aspects of this phase transformation, it must be investigated in more detail in the continuous design of smart HA micro- and nano-structures with advanced therapeutic potentials.",
journal = "Materials Science and Engineering: C",
title = "Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies",
pages = "746-757",
volume = "68",
doi = "10.1016/j.msec.2016.06.047",
url = "https://hdl.handle.net/21.15107/rcub_dais_15985"
}

Stojanović, Z. S., Ignjatović, N., Wu, V., Žunič, V., Veselinović, L., Škapin, S. D., Miljković, M., Uskoković, V.,& Uskoković, D.. (2016). Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies. in Materials Science and Engineering: C, 68, 746-757.
https://doi.org/10.1016/j.msec.2016.06.047
https://hdl.handle.net/21.15107/rcub_dais_15985

Stojanović ZS, Ignjatović N, Wu V, Žunič V, Veselinović L, Škapin SD, Miljković M, Uskoković V, Uskoković D. Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies. in Materials Science and Engineering: C. 2016;68:746-757.
doi:10.1016/j.msec.2016.06.047
https://hdl.handle.net/21.15107/rcub_dais_15985 .

Stojanović, Zoran S., Ignjatović, Nenad, Wu, Victoria, Žunič, Vojka, Veselinović, Ljiljana, Škapin, Srečo Davor, Miljković, Miroslav, Uskoković, Vuk, Uskoković, Dragan, "Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies" in Materials Science and Engineering: C, 68 (2016):746-757,
https://doi.org/10.1016/j.msec.2016.06.047 .,
https://hdl.handle.net/21.15107/rcub_dais_15985 .

TY  - JOUR
AU  - Stevanović, Magdalena
AU  - Uskoković, Vuk
AU  - Filipović, Miloš
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/15986
AB  - The global rise in the resistance of pathogens to conventional antibiotics has created an intensive search for alternative materials with antimicrobial properties. This study is performed with an intention to investigate the combined effects of poly(L-glutamic acid)-capped silver nanoparticles (AgNpPGA) and ascorbic acid (AscH) encapsulated within freeze-dried poly(lactide-co-glycolide) (PLGA) nanospheres to obtain a nanomaterial with simultaneous osteoinductive, antioxidative, and prolonged antimicrobial properties. The influence of PLGA/AgNpPGA/AscH particles on (i) viability and super-oxide production of human umbilical vein endothelial cells in vitro, (ii) morphology and expression of osteogenic markers in osteoblastic MC3T3-E1 cells in vitro, and (iii) antimicrobial activity against a Gram-positive bacterium, methicillin-resistant Staphylococcus aureus, and a Gram-negative bacterium, Escherichia coli, was investigated. PLGA/AgNpPGA/AscH nanoparticles showed a superior and extended antibacterial activity against both types of bacteria. The nanoparticles appeared to be capable of delivering ascorbate to the cells, which was evidenced by the significant decrease in the level of superoxides in human umbilical vein endothelial cells and which could have a therapeutic potential in preventing oxidative stress. PLGA/AgNpPGA/AscH nanoparticles had a positive effect on MC3T3-E1 osteoblastic cells in vitro, promoting: (i) an intimate contact with the cells and preservation of their healthy morphologies; (ii) unreduced cell viability; and (iii) multiple-fold upregulation of two osteogenic markers: osteocalcin and type I procollagen. It is concluded that PLGA/AgNpPGA/AscH nanospheres present a promising new material for the treatment of infections and use in wound dressings and other prophylactic applications.
PB  - American Chemical Society
T2  - ACS Applied Materials and Interfaces
T1  - Composite PLGA/AgNpPGA/AscH Nanospheres with Combined Osteoinductive, Antioxidative, and Antimicrobial Activities
SP  - 9034
EP  - 9042
VL  - 5
IS  - 18
DO  - 10.1021/am402237g
UR  - https://hdl.handle.net/21.15107/rcub_dais_15986
ER  - 

@article{
author = "Stevanović, Magdalena and Uskoković, Vuk and Filipović, Miloš and Škapin, Srečo Davor and Uskoković, Dragan",
year = "2013",
abstract = "The global rise in the resistance of pathogens to conventional antibiotics has created an intensive search for alternative materials with antimicrobial properties. This study is performed with an intention to investigate the combined effects of poly(L-glutamic acid)-capped silver nanoparticles (AgNpPGA) and ascorbic acid (AscH) encapsulated within freeze-dried poly(lactide-co-glycolide) (PLGA) nanospheres to obtain a nanomaterial with simultaneous osteoinductive, antioxidative, and prolonged antimicrobial properties. The influence of PLGA/AgNpPGA/AscH particles on (i) viability and super-oxide production of human umbilical vein endothelial cells in vitro, (ii) morphology and expression of osteogenic markers in osteoblastic MC3T3-E1 cells in vitro, and (iii) antimicrobial activity against a Gram-positive bacterium, methicillin-resistant Staphylococcus aureus, and a Gram-negative bacterium, Escherichia coli, was investigated. PLGA/AgNpPGA/AscH nanoparticles showed a superior and extended antibacterial activity against both types of bacteria. The nanoparticles appeared to be capable of delivering ascorbate to the cells, which was evidenced by the significant decrease in the level of superoxides in human umbilical vein endothelial cells and which could have a therapeutic potential in preventing oxidative stress. PLGA/AgNpPGA/AscH nanoparticles had a positive effect on MC3T3-E1 osteoblastic cells in vitro, promoting: (i) an intimate contact with the cells and preservation of their healthy morphologies; (ii) unreduced cell viability; and (iii) multiple-fold upregulation of two osteogenic markers: osteocalcin and type I procollagen. It is concluded that PLGA/AgNpPGA/AscH nanospheres present a promising new material for the treatment of infections and use in wound dressings and other prophylactic applications.",
publisher = "American Chemical Society",
journal = "ACS Applied Materials and Interfaces",
title = "Composite PLGA/AgNpPGA/AscH Nanospheres with Combined Osteoinductive, Antioxidative, and Antimicrobial Activities",
pages = "9034-9042",
volume = "5",
number = "18",
doi = "10.1021/am402237g",
url = "https://hdl.handle.net/21.15107/rcub_dais_15986"
}

Stevanović, M., Uskoković, V., Filipović, M., Škapin, S. D.,& Uskoković, D.. (2013). Composite PLGA/AgNpPGA/AscH Nanospheres with Combined Osteoinductive, Antioxidative, and Antimicrobial Activities. in ACS Applied Materials and Interfaces
American Chemical Society., 5(18), 9034-9042.
https://doi.org/10.1021/am402237g
https://hdl.handle.net/21.15107/rcub_dais_15986

Stevanović M, Uskoković V, Filipović M, Škapin SD, Uskoković D. Composite PLGA/AgNpPGA/AscH Nanospheres with Combined Osteoinductive, Antioxidative, and Antimicrobial Activities. in ACS Applied Materials and Interfaces. 2013;5(18):9034-9042.
doi:10.1021/am402237g
https://hdl.handle.net/21.15107/rcub_dais_15986 .

Stevanović, Magdalena, Uskoković, Vuk, Filipović, Miloš, Škapin, Srečo Davor, Uskoković, Dragan, "Composite PLGA/AgNpPGA/AscH Nanospheres with Combined Osteoinductive, Antioxidative, and Antimicrobial Activities" in ACS Applied Materials and Interfaces, 5, no. 18 (2013):9034-9042,
https://doi.org/10.1021/am402237g .,
https://hdl.handle.net/21.15107/rcub_dais_15986 .

TY  - JOUR
AU  - Ignjatović, Nenad
AU  - Uskoković, Vuk
AU  - Ajduković, Zorica
AU  - Uskoković, Dragan
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/354
AB  - Cholecalciferol, vitamin D3, plays an important role in bone metabolism by regulating extracellular levels of calcium. Presented here is a study on the effects of the local delivery of cholecalciferol (D3) using nanoparticulate carriers composed of hydroxyapatite (HAp) and poly(d,l-lactide-co-glycolide) (PLGA). Multifunctional nanoparticulate HAp-based powders were prepared for the purpose of: (a) either fast or sustained, local delivery of cholecalciferol, and (b) the secondary, osteoconductive and defect-filling effect of the carrier itself. Two types of HAp-based powders with particles of narrowly dispersed sizes in the nano range were prepared and tested in this study: HAp nanoparticles as direct cholecalciferol delivery agents and HAp nanoparticles coated with cholecalciferol-loaded poly(d,l)-lactide-co-glycolide (HAp/D3/PLGA).

Satisfying biocompatibility of particulate systems, when incubated in contact with MC3T3-E1 osteoblastic cells in vitro, was observed for HAp/D3/PLGA and pure HAp. In contrast, an extensively fast release of cholecalciferol from the system comprising HAp nanoparticles coated with cholecalciferol (HAp/D3) triggered necrosis of the osteoblastic cells in vitro. Artificial defects induced in the osteoporotic bone of the rat mandible were successfully reconstructed following implantation of cholecalciferol-coated HAp nanoparticles as well as those comprising HAp nanoparticles coated with cholecalciferol-loaded PLGA (HAp/D3/PLGA). The greatest levels of enhanced angiogenesis, vascularization, osteogenesis and bone structure differentiation were achieved upon the implementation of HAp/D3/PLGA systems.
PB  - Elsevier
T2  - Materials Science and Engineering: C
T1  - Multifunctional hydroxyapatite and poly(D,L-lactide-co-glycolide) nanoparticles for the local delivery of cholecalciferol
SP  - 943
EP  - 950
VL  - 33
IS  - 2
DO  - 10.1016/j.msec.2012.11.026
UR  - https://hdl.handle.net/21.15107/rcub_dais_354
ER  - 

@article{
author = "Ignjatović, Nenad and Uskoković, Vuk and Ajduković, Zorica and Uskoković, Dragan",
year = "2013",
abstract = "Cholecalciferol, vitamin D3, plays an important role in bone metabolism by regulating extracellular levels of calcium. Presented here is a study on the effects of the local delivery of cholecalciferol (D3) using nanoparticulate carriers composed of hydroxyapatite (HAp) and poly(d,l-lactide-co-glycolide) (PLGA). Multifunctional nanoparticulate HAp-based powders were prepared for the purpose of: (a) either fast or sustained, local delivery of cholecalciferol, and (b) the secondary, osteoconductive and defect-filling effect of the carrier itself. Two types of HAp-based powders with particles of narrowly dispersed sizes in the nano range were prepared and tested in this study: HAp nanoparticles as direct cholecalciferol delivery agents and HAp nanoparticles coated with cholecalciferol-loaded poly(d,l)-lactide-co-glycolide (HAp/D3/PLGA).

Satisfying biocompatibility of particulate systems, when incubated in contact with MC3T3-E1 osteoblastic cells in vitro, was observed for HAp/D3/PLGA and pure HAp. In contrast, an extensively fast release of cholecalciferol from the system comprising HAp nanoparticles coated with cholecalciferol (HAp/D3) triggered necrosis of the osteoblastic cells in vitro. Artificial defects induced in the osteoporotic bone of the rat mandible were successfully reconstructed following implantation of cholecalciferol-coated HAp nanoparticles as well as those comprising HAp nanoparticles coated with cholecalciferol-loaded PLGA (HAp/D3/PLGA). The greatest levels of enhanced angiogenesis, vascularization, osteogenesis and bone structure differentiation were achieved upon the implementation of HAp/D3/PLGA systems.",
publisher = "Elsevier",
journal = "Materials Science and Engineering: C",
title = "Multifunctional hydroxyapatite and poly(D,L-lactide-co-glycolide) nanoparticles for the local delivery of cholecalciferol",
pages = "943-950",
volume = "33",
number = "2",
doi = "10.1016/j.msec.2012.11.026",
url = "https://hdl.handle.net/21.15107/rcub_dais_354"
}

Ignjatović, N., Uskoković, V., Ajduković, Z.,& Uskoković, D.. (2013). Multifunctional hydroxyapatite and poly(D,L-lactide-co-glycolide) nanoparticles for the local delivery of cholecalciferol. in Materials Science and Engineering: C
Elsevier., 33(2), 943-950.
https://doi.org/10.1016/j.msec.2012.11.026
https://hdl.handle.net/21.15107/rcub_dais_354

Ignjatović N, Uskoković V, Ajduković Z, Uskoković D. Multifunctional hydroxyapatite and poly(D,L-lactide-co-glycolide) nanoparticles for the local delivery of cholecalciferol. in Materials Science and Engineering: C. 2013;33(2):943-950.
doi:10.1016/j.msec.2012.11.026
https://hdl.handle.net/21.15107/rcub_dais_354 .

Ignjatović, Nenad, Uskoković, Vuk, Ajduković, Zorica, Uskoković, Dragan, "Multifunctional hydroxyapatite and poly(D,L-lactide-co-glycolide) nanoparticles for the local delivery of cholecalciferol" in Materials Science and Engineering: C, 33, no. 2 (2013):943-950,
https://doi.org/10.1016/j.msec.2012.11.026 .,
https://hdl.handle.net/21.15107/rcub_dais_354 .

TY  - JOUR
AU  - Ignjatović, Nenad
AU  - Ajduković, Zorica
AU  - Savić, Vojin
AU  - Najman, Stevo
AU  - Mihailović, Dragan
AU  - Vasiljević, Perica
AU  - Stojanović, Zoran S.
AU  - Uskoković, Vuk
AU  - Uskoković, Dragan
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/353
AB  - Indications exist that paramagnetic calcium phosphates may be able to promote regeneration of bone faster than their regular, diamagnetic counterparts. In this study, analyzed was the influence of paramagnetic cobalt-substituted hydroxyapatite nanoparticles on osteoporotic alveolar bone regeneration in rats. Simultaneously, biocompatibility of the material was tested in vitro, on osteoblastic MC3T3-E1 and epithelial Caco-2 cells in culture. The material was shown to be biocompatible and nontoxic when added to epithelial monolayers in vitro, while it caused a substantial decrease in the cell viability as well as deformation of the cytoskeleton and cell morphology when incubated with the osteoblastic cells. In the course of 6 months after the implantation of the material containing different amounts of cobalt, ranging from 5 to 12 wt%, in the osteoporotic alveolar bone of the lower jaw, the following parameters were investigated: histopathological parameters, alkaline phosphatase and alveolar bone density. The best result in terms of osteoporotic bone tissue regeneration was observed for hydroxyapatite nanoparticles with the largest content of cobalt ions. The histological analysis showed a high level of reparatory ability of the nanoparticulate material implanted in the bone defect, paralleled by a corresponding increase in the alveolar bone density. The combined effect of growth factors from autologous plasma admixed to cobalt-substituted hydroxyapatite was furthermore shown to have a crucial effect on the augmented osteoporotic bone regeneration upon the implantation of the biomaterial investigated in this study.
PB  - Springer
T2  - Journal of Materials Science: Materials in Medicine
T1  - Nanoparticles of cobalt-substituted hydroxyapatite in regeneration of mandibular osteoporotic bones
SP  - 343
EP  - 354
VL  - 24
IS  - 2
DO  - 10.1007/s10856-012-4793-1
UR  - https://hdl.handle.net/21.15107/rcub_dais_353
ER  - 

@article{
author = "Ignjatović, Nenad and Ajduković, Zorica and Savić, Vojin and Najman, Stevo and Mihailović, Dragan and Vasiljević, Perica and Stojanović, Zoran S. and Uskoković, Vuk and Uskoković, Dragan",
year = "2013",
abstract = "Indications exist that paramagnetic calcium phosphates may be able to promote regeneration of bone faster than their regular, diamagnetic counterparts. In this study, analyzed was the influence of paramagnetic cobalt-substituted hydroxyapatite nanoparticles on osteoporotic alveolar bone regeneration in rats. Simultaneously, biocompatibility of the material was tested in vitro, on osteoblastic MC3T3-E1 and epithelial Caco-2 cells in culture. The material was shown to be biocompatible and nontoxic when added to epithelial monolayers in vitro, while it caused a substantial decrease in the cell viability as well as deformation of the cytoskeleton and cell morphology when incubated with the osteoblastic cells. In the course of 6 months after the implantation of the material containing different amounts of cobalt, ranging from 5 to 12 wt%, in the osteoporotic alveolar bone of the lower jaw, the following parameters were investigated: histopathological parameters, alkaline phosphatase and alveolar bone density. The best result in terms of osteoporotic bone tissue regeneration was observed for hydroxyapatite nanoparticles with the largest content of cobalt ions. The histological analysis showed a high level of reparatory ability of the nanoparticulate material implanted in the bone defect, paralleled by a corresponding increase in the alveolar bone density. The combined effect of growth factors from autologous plasma admixed to cobalt-substituted hydroxyapatite was furthermore shown to have a crucial effect on the augmented osteoporotic bone regeneration upon the implantation of the biomaterial investigated in this study.",
publisher = "Springer",
journal = "Journal of Materials Science: Materials in Medicine",
title = "Nanoparticles of cobalt-substituted hydroxyapatite in regeneration of mandibular osteoporotic bones",
pages = "343-354",
volume = "24",
number = "2",
doi = "10.1007/s10856-012-4793-1",
url = "https://hdl.handle.net/21.15107/rcub_dais_353"
}

Ignjatović, N., Ajduković, Z., Savić, V., Najman, S., Mihailović, D., Vasiljević, P., Stojanović, Z. S., Uskoković, V.,& Uskoković, D.. (2013). Nanoparticles of cobalt-substituted hydroxyapatite in regeneration of mandibular osteoporotic bones. in Journal of Materials Science: Materials in Medicine
Springer., 24(2), 343-354.
https://doi.org/10.1007/s10856-012-4793-1
https://hdl.handle.net/21.15107/rcub_dais_353

Ignjatović N, Ajduković Z, Savić V, Najman S, Mihailović D, Vasiljević P, Stojanović ZS, Uskoković V, Uskoković D. Nanoparticles of cobalt-substituted hydroxyapatite in regeneration of mandibular osteoporotic bones. in Journal of Materials Science: Materials in Medicine. 2013;24(2):343-354.
doi:10.1007/s10856-012-4793-1
https://hdl.handle.net/21.15107/rcub_dais_353 .

Ignjatović, Nenad, Ajduković, Zorica, Savić, Vojin, Najman, Stevo, Mihailović, Dragan, Vasiljević, Perica, Stojanović, Zoran S., Uskoković, Vuk, Uskoković, Dragan, "Nanoparticles of cobalt-substituted hydroxyapatite in regeneration of mandibular osteoporotic bones" in Journal of Materials Science: Materials in Medicine, 24, no. 2 (2013):343-354,
https://doi.org/10.1007/s10856-012-4793-1 .,
https://hdl.handle.net/21.15107/rcub_dais_353 .

TY  - JOUR
AU  - Ignjatović, Nenad
AU  - Ajduković, Zorica
AU  - Savić, Vojin
AU  - Najman, Stevo
AU  - Mihailović, Dragan
AU  - Vasiljević, Perica
AU  - Stojanović, Zoran S.
AU  - Uskoković, Vuk
AU  - Uskoković, Dragan
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/572
AB  - Indications exist that paramagnetic calcium phosphates may be able to promote regeneration of bone faster than their regular, diamagnetic counterparts. In this study, analyzed was the influence of paramagnetic cobalt-substituted hydroxyapatite nanoparticles on osteoporotic alveolar bone regeneration in rats. Simultaneously, biocompatibility of the material was tested in vitro, on osteoblastic MC3T3-E1 and epithelial Caco-2 cells in culture. The material was shown to be biocompatible and nontoxic when added to epithelial monolayers in vitro, while it caused a substantial decrease in the cell viability as well as deformation of the cytoskeleton and cell morphology when incubated with the osteoblastic cells. In the course of 6 months after the implantation of the material containing different amounts of cobalt, ranging from 5 to 12 wt%, in the osteoporotic alveolar bone of the lower jaw, the following parameters were investigated: histopathological parameters, alkaline phosphatase and alveolar bone density. The best result in terms of osteoporotic bone tissue regeneration was observed for hydroxyapatite nanoparticles with the largest content of cobalt ions. The histological analysis showed a high level of reparatory ability of the nanoparticulate material implanted in the bone defect, paralleled by a corresponding increase in the alveolar bone density. The combined effect of growth factors from autologous plasma admixed to cobalt-substituted hydroxyapatite was furthermore shown to have a crucial effect on the augmented osteoporotic bone regeneration upon the implantation of the biomaterial investigated in this study.
T2  - Journal of Materials Science: Materials in Medicine
T1  - Nanoparticles of cobalt-substituted hydroxyapatite in regeneration of mandibular osteoporotic bones
SP  - 343
EP  - 354
VL  - 24
IS  - 2
DO  - 10.1007/s10856-012-4793-1
UR  - https://hdl.handle.net/21.15107/rcub_dais_572
ER  - 

@article{
author = "Ignjatović, Nenad and Ajduković, Zorica and Savić, Vojin and Najman, Stevo and Mihailović, Dragan and Vasiljević, Perica and Stojanović, Zoran S. and Uskoković, Vuk and Uskoković, Dragan",
year = "2013",
abstract = "Indications exist that paramagnetic calcium phosphates may be able to promote regeneration of bone faster than their regular, diamagnetic counterparts. In this study, analyzed was the influence of paramagnetic cobalt-substituted hydroxyapatite nanoparticles on osteoporotic alveolar bone regeneration in rats. Simultaneously, biocompatibility of the material was tested in vitro, on osteoblastic MC3T3-E1 and epithelial Caco-2 cells in culture. The material was shown to be biocompatible and nontoxic when added to epithelial monolayers in vitro, while it caused a substantial decrease in the cell viability as well as deformation of the cytoskeleton and cell morphology when incubated with the osteoblastic cells. In the course of 6 months after the implantation of the material containing different amounts of cobalt, ranging from 5 to 12 wt%, in the osteoporotic alveolar bone of the lower jaw, the following parameters were investigated: histopathological parameters, alkaline phosphatase and alveolar bone density. The best result in terms of osteoporotic bone tissue regeneration was observed for hydroxyapatite nanoparticles with the largest content of cobalt ions. The histological analysis showed a high level of reparatory ability of the nanoparticulate material implanted in the bone defect, paralleled by a corresponding increase in the alveolar bone density. The combined effect of growth factors from autologous plasma admixed to cobalt-substituted hydroxyapatite was furthermore shown to have a crucial effect on the augmented osteoporotic bone regeneration upon the implantation of the biomaterial investigated in this study.",
journal = "Journal of Materials Science: Materials in Medicine",
title = "Nanoparticles of cobalt-substituted hydroxyapatite in regeneration of mandibular osteoporotic bones",
pages = "343-354",
volume = "24",
number = "2",
doi = "10.1007/s10856-012-4793-1",
url = "https://hdl.handle.net/21.15107/rcub_dais_572"
}

Ignjatović, N., Ajduković, Z., Savić, V., Najman, S., Mihailović, D., Vasiljević, P., Stojanović, Z. S., Uskoković, V.,& Uskoković, D.. (2013). Nanoparticles of cobalt-substituted hydroxyapatite in regeneration of mandibular osteoporotic bones. in Journal of Materials Science: Materials in Medicine, 24(2), 343-354.
https://doi.org/10.1007/s10856-012-4793-1
https://hdl.handle.net/21.15107/rcub_dais_572

Ignjatović N, Ajduković Z, Savić V, Najman S, Mihailović D, Vasiljević P, Stojanović ZS, Uskoković V, Uskoković D. Nanoparticles of cobalt-substituted hydroxyapatite in regeneration of mandibular osteoporotic bones. in Journal of Materials Science: Materials in Medicine. 2013;24(2):343-354.
doi:10.1007/s10856-012-4793-1
https://hdl.handle.net/21.15107/rcub_dais_572 .

Ignjatović, Nenad, Ajduković, Zorica, Savić, Vojin, Najman, Stevo, Mihailović, Dragan, Vasiljević, Perica, Stojanović, Zoran S., Uskoković, Vuk, Uskoković, Dragan, "Nanoparticles of cobalt-substituted hydroxyapatite in regeneration of mandibular osteoporotic bones" in Journal of Materials Science: Materials in Medicine, 24, no. 2 (2013):343-354,
https://doi.org/10.1007/s10856-012-4793-1 .,
https://hdl.handle.net/21.15107/rcub_dais_572 .

TY  - JOUR
AU  - Uskoković, Vuk
AU  - Hoover, Charles
AU  - Vukomanović, Marija
AU  - Uskoković, Dragan
AU  - Desai, Tejal A.
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/382
AB  - Development of a material for simultaneous sustained and localized delivery of antibiotics and induction of spontaneous regeneration of hard tissues affected by osteomyelitis stands for an important clinical need. In this work, a comparative analysis of the bacterial and osteoblastic cell response to two different nanoparticulate carriers of clindamycin, an antibiotic commonly prescribed in the treatment of bone infection, one composed of calcium phosphate and the other comprising poly-(D,L-lactide-co-glycolide)-coated calcium phosphate, was carried out. Three different non-cytotoxic phases of calcium phosphate, exhibiting dissolution and drug release profiles in the range of one week to two months to one year, respectively, were included in the analysis: monetite, amorphous calcium phosphate and hydroxyapatite. Spherical morphologies and narrow size distribution of both types of nanopowders were confirmed in transmission and scanning electron microscopic analyses. The antibiotic-containing powders exhibited sustained drug release contingent upon the degradation rate of the carrier. Assessment of the antibacterial performance of the antibiotic-encapsulated powders against Staphylococcus aureus, the most common pathogen isolated from infected bone, yielded satisfactory results both in broths and on blood agar plates for all the analyzed powders. In contrast, no cytotoxic behavior was detected upon the incubation of the antibiotic powders with the osteoblastic MC3T3-E1 cell line for up to three weeks. The cells were shown to engage in a close contact with the antibiotic-containing particles, irrespective of their internal or surface phase composition, polymeric or mineral. At the same time, both types of particles upregulated the expression of osteogenic markers osteocalcin, osteopontin, Runx2 and protocollagen type I, suggesting their ability to promote osteogenesis and enhance remineralization of the infected site in addition to eliminating the bacterial source of infection.
PB  - Elsevier
T2  - Materials Science and Engineering: C
T1  - Osteogenic and Antimicrobial Nanoparticulate Calcium Phosphate and Poly-(D, L-Lactide-co-Glycolide) Powders for the Treatment of Osteomyelitis
SP  - 3362
EP  - 3373
VL  - 33
IS  - 6
DO  - 10.1016/j.msec.2013.04.023
UR  - https://hdl.handle.net/21.15107/rcub_dais_382
ER  - 

@article{
author = "Uskoković, Vuk and Hoover, Charles and Vukomanović, Marija and Uskoković, Dragan and Desai, Tejal A.",
year = "2013",
abstract = "Development of a material for simultaneous sustained and localized delivery of antibiotics and induction of spontaneous regeneration of hard tissues affected by osteomyelitis stands for an important clinical need. In this work, a comparative analysis of the bacterial and osteoblastic cell response to two different nanoparticulate carriers of clindamycin, an antibiotic commonly prescribed in the treatment of bone infection, one composed of calcium phosphate and the other comprising poly-(D,L-lactide-co-glycolide)-coated calcium phosphate, was carried out. Three different non-cytotoxic phases of calcium phosphate, exhibiting dissolution and drug release profiles in the range of one week to two months to one year, respectively, were included in the analysis: monetite, amorphous calcium phosphate and hydroxyapatite. Spherical morphologies and narrow size distribution of both types of nanopowders were confirmed in transmission and scanning electron microscopic analyses. The antibiotic-containing powders exhibited sustained drug release contingent upon the degradation rate of the carrier. Assessment of the antibacterial performance of the antibiotic-encapsulated powders against Staphylococcus aureus, the most common pathogen isolated from infected bone, yielded satisfactory results both in broths and on blood agar plates for all the analyzed powders. In contrast, no cytotoxic behavior was detected upon the incubation of the antibiotic powders with the osteoblastic MC3T3-E1 cell line for up to three weeks. The cells were shown to engage in a close contact with the antibiotic-containing particles, irrespective of their internal or surface phase composition, polymeric or mineral. At the same time, both types of particles upregulated the expression of osteogenic markers osteocalcin, osteopontin, Runx2 and protocollagen type I, suggesting their ability to promote osteogenesis and enhance remineralization of the infected site in addition to eliminating the bacterial source of infection.",
publisher = "Elsevier",
journal = "Materials Science and Engineering: C",
title = "Osteogenic and Antimicrobial Nanoparticulate Calcium Phosphate and Poly-(D, L-Lactide-co-Glycolide) Powders for the Treatment of Osteomyelitis",
pages = "3362-3373",
volume = "33",
number = "6",
doi = "10.1016/j.msec.2013.04.023",
url = "https://hdl.handle.net/21.15107/rcub_dais_382"
}

Uskoković, V., Hoover, C., Vukomanović, M., Uskoković, D.,& Desai, T. A.. (2013). Osteogenic and Antimicrobial Nanoparticulate Calcium Phosphate and Poly-(D, L-Lactide-co-Glycolide) Powders for the Treatment of Osteomyelitis. in Materials Science and Engineering: C
Elsevier., 33(6), 3362-3373.
https://doi.org/10.1016/j.msec.2013.04.023
https://hdl.handle.net/21.15107/rcub_dais_382

Uskoković V, Hoover C, Vukomanović M, Uskoković D, Desai TA. Osteogenic and Antimicrobial Nanoparticulate Calcium Phosphate and Poly-(D, L-Lactide-co-Glycolide) Powders for the Treatment of Osteomyelitis. in Materials Science and Engineering: C. 2013;33(6):3362-3373.
doi:10.1016/j.msec.2013.04.023
https://hdl.handle.net/21.15107/rcub_dais_382 .

Uskoković, Vuk, Hoover, Charles, Vukomanović, Marija, Uskoković, Dragan, Desai, Tejal A., "Osteogenic and Antimicrobial Nanoparticulate Calcium Phosphate and Poly-(D, L-Lactide-co-Glycolide) Powders for the Treatment of Osteomyelitis" in Materials Science and Engineering: C, 33, no. 6 (2013):3362-3373,
https://doi.org/10.1016/j.msec.2013.04.023 .,
https://hdl.handle.net/21.15107/rcub_dais_382 .

TY  - JOUR
AU  - Stevanović, Magdalena
AU  - Uskoković, Vuk
AU  - Filipović, Miloš
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/381
AB  - The global rise in the resistance of pathogens to conventional antibiotics has created an intensive search for alternative materials with antimicrobial properties. This study is performed with an intention to investigate the combined effects of poly(l-glutamic acid)-capped silver nanoparticles (AgNpPGA) and ascorbic acid (AscH) encapsulated within freeze-dried poly(lactide-co-glycolide) (PLGA) nanospheres to obtain a nanomaterial with simultaneous osteoinductive, antioxidative, and prolonged antimicrobial properties. The influence of PLGA/AgNpPGA/AscH particles on (i) viability and superoxide production of human umbilical vein endothelial cells in vitro, (ii) morphology and expression of osteogenic markers in osteoblastic MC3T3-E1 cells in vitro, and (iii) antimicrobial activity against a Gram-positive bacterium, methicillin-resistant Staphylococcus aureus, and a Gram-negative bacterium, Escherichia coli, was investigated. PLGA/AgNpPGA/AscH nanoparticles showed a superior and extended antibacterial activity against both types of bacteria. The nanoparticles appeared to be capable of delivering ascorbate to the cells, which was evidenced by the significant decrease in the level of superoxides in human umbilical vein endothelial cells and which could have a therapeutic potential in preventing oxidative stress. PLGA/AgNpPGA/AscH nanoparticles had a positive effect on MC3T3-E1 osteoblastic cells in vitro, promoting: (i) an intimate contact with the cells and preservation of their healthy morphologies; (ii) unreduced cell viability; and (iii) multiple-fold upregulation of two osteogenic markers: osteocalcin and type I procollagen. It is concluded that PLGA/AgNpPGA/AscH nanospheres present a promising new material for the treatment of infections and use in wound dressings and other prophylactic applications.
PB  - American Chemical Society
T2  - ACS Applied Materials and Interfaces
T1  - Composite PLGA/AgNpPGA/AscH nanospheres with combined osteoinductive, antioxidative and antimicrobial activities
SP  - 9034
EP  - 9042
VL  - 5
IS  - 18
DO  - 10.1021/am402237g
UR  - https://hdl.handle.net/21.15107/rcub_dais_381
ER  - 

@article{
author = "Stevanović, Magdalena and Uskoković, Vuk and Filipović, Miloš and Škapin, Srečo Davor and Uskoković, Dragan",
year = "2013",
abstract = "The global rise in the resistance of pathogens to conventional antibiotics has created an intensive search for alternative materials with antimicrobial properties. This study is performed with an intention to investigate the combined effects of poly(l-glutamic acid)-capped silver nanoparticles (AgNpPGA) and ascorbic acid (AscH) encapsulated within freeze-dried poly(lactide-co-glycolide) (PLGA) nanospheres to obtain a nanomaterial with simultaneous osteoinductive, antioxidative, and prolonged antimicrobial properties. The influence of PLGA/AgNpPGA/AscH particles on (i) viability and superoxide production of human umbilical vein endothelial cells in vitro, (ii) morphology and expression of osteogenic markers in osteoblastic MC3T3-E1 cells in vitro, and (iii) antimicrobial activity against a Gram-positive bacterium, methicillin-resistant Staphylococcus aureus, and a Gram-negative bacterium, Escherichia coli, was investigated. PLGA/AgNpPGA/AscH nanoparticles showed a superior and extended antibacterial activity against both types of bacteria. The nanoparticles appeared to be capable of delivering ascorbate to the cells, which was evidenced by the significant decrease in the level of superoxides in human umbilical vein endothelial cells and which could have a therapeutic potential in preventing oxidative stress. PLGA/AgNpPGA/AscH nanoparticles had a positive effect on MC3T3-E1 osteoblastic cells in vitro, promoting: (i) an intimate contact with the cells and preservation of their healthy morphologies; (ii) unreduced cell viability; and (iii) multiple-fold upregulation of two osteogenic markers: osteocalcin and type I procollagen. It is concluded that PLGA/AgNpPGA/AscH nanospheres present a promising new material for the treatment of infections and use in wound dressings and other prophylactic applications.",
publisher = "American Chemical Society",
journal = "ACS Applied Materials and Interfaces",
title = "Composite PLGA/AgNpPGA/AscH nanospheres with combined osteoinductive, antioxidative and antimicrobial activities",
pages = "9034-9042",
volume = "5",
number = "18",
doi = "10.1021/am402237g",
url = "https://hdl.handle.net/21.15107/rcub_dais_381"
}

Stevanović, M., Uskoković, V., Filipović, M., Škapin, S. D.,& Uskoković, D.. (2013). Composite PLGA/AgNpPGA/AscH nanospheres with combined osteoinductive, antioxidative and antimicrobial activities. in ACS Applied Materials and Interfaces
American Chemical Society., 5(18), 9034-9042.
https://doi.org/10.1021/am402237g
https://hdl.handle.net/21.15107/rcub_dais_381

Stevanović M, Uskoković V, Filipović M, Škapin SD, Uskoković D. Composite PLGA/AgNpPGA/AscH nanospheres with combined osteoinductive, antioxidative and antimicrobial activities. in ACS Applied Materials and Interfaces. 2013;5(18):9034-9042.
doi:10.1021/am402237g
https://hdl.handle.net/21.15107/rcub_dais_381 .

Stevanović, Magdalena, Uskoković, Vuk, Filipović, Miloš, Škapin, Srečo Davor, Uskoković, Dragan, "Composite PLGA/AgNpPGA/AscH nanospheres with combined osteoinductive, antioxidative and antimicrobial activities" in ACS Applied Materials and Interfaces, 5, no. 18 (2013):9034-9042,
https://doi.org/10.1021/am402237g .,
https://hdl.handle.net/21.15107/rcub_dais_381 .

TY  - JOUR
AU  - Ignjatović, Nenad
AU  - Uskoković, Vuk
AU  - Ajduković, Zorica
AU  - Uskoković, Dragan
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/15982
AB  - Cholecalciferol, vitamin D3, plays an important role in bone metabolism by regulating extracellular levels of calcium. Presented here is a study on the effects of the local delivery of cholecalciferol (D3) using nanoparticulate carriers composed of hydroxyapatite (HAp) and poly(D,L-lactide-co-glycolide) (PLGA). Multifunctional nanoparticulate HAp-based powders were prepared for the purpose of: (a) either fast or sustained, local delivery of cholecalciferol, and (b) the secondary, osteoconductive and defect-filling effect of the carrier itself. Two types of HAp-based powders with particles of narrowly dispersed sizes in the nano range were prepared and tested in this study: HAp nanoparticles as direct cholecalciferol delivery agents and HAp nanoparticles coated with cholecalciferol-loaded poly(D,L)-lactide-co-glycolide (HAp/D3/PLGA).

Satisfying biocompatibility of particulate systems, when incubated in contact with MC3T3-E1 osteoblastic cells in vitro, was observed for HAp/D3/PLGA and pure HAp. In contrast, an extensively fast release of cholecalciferol from the system comprising HAp nanoparticles coated with cholecalciferol (HAp/D3) triggered necrosis of the osteoblastic cells in vitro. Artificial defects induced in the osteoporotic bone of the rat mandible were successfully reconstructed following implantation of cholecalciferol-coated HAp nanoparticles as well as those comprising HAp nanoparticles coated with cholecalciferol-loaded PLGA (HAp/D3/PLGA). The greatest levels of enhanced angiogenesis, vascularization, osteogenesis and bone structure differentiation were achieved upon the implementation of HAp/D3/PLGA systems.
T2  - Materials Science and Engineering: C
T1  - Multifunctional hydroxyapatite and poly(D,L-lactide-co-glycolide) nanoparticles for the local delivery of cholecalciferol
SP  - 943
EP  - 950
VL  - 33
IS  - 2
DO  - 10.1016/j.msec.2012.11.026
UR  - https://hdl.handle.net/21.15107/rcub_dais_15982
ER  - 

@article{
author = "Ignjatović, Nenad and Uskoković, Vuk and Ajduković, Zorica and Uskoković, Dragan",
year = "2013",
abstract = "Cholecalciferol, vitamin D3, plays an important role in bone metabolism by regulating extracellular levels of calcium. Presented here is a study on the effects of the local delivery of cholecalciferol (D3) using nanoparticulate carriers composed of hydroxyapatite (HAp) and poly(D,L-lactide-co-glycolide) (PLGA). Multifunctional nanoparticulate HAp-based powders were prepared for the purpose of: (a) either fast or sustained, local delivery of cholecalciferol, and (b) the secondary, osteoconductive and defect-filling effect of the carrier itself. Two types of HAp-based powders with particles of narrowly dispersed sizes in the nano range were prepared and tested in this study: HAp nanoparticles as direct cholecalciferol delivery agents and HAp nanoparticles coated with cholecalciferol-loaded poly(D,L)-lactide-co-glycolide (HAp/D3/PLGA).

Satisfying biocompatibility of particulate systems, when incubated in contact with MC3T3-E1 osteoblastic cells in vitro, was observed for HAp/D3/PLGA and pure HAp. In contrast, an extensively fast release of cholecalciferol from the system comprising HAp nanoparticles coated with cholecalciferol (HAp/D3) triggered necrosis of the osteoblastic cells in vitro. Artificial defects induced in the osteoporotic bone of the rat mandible were successfully reconstructed following implantation of cholecalciferol-coated HAp nanoparticles as well as those comprising HAp nanoparticles coated with cholecalciferol-loaded PLGA (HAp/D3/PLGA). The greatest levels of enhanced angiogenesis, vascularization, osteogenesis and bone structure differentiation were achieved upon the implementation of HAp/D3/PLGA systems.",
journal = "Materials Science and Engineering: C",
title = "Multifunctional hydroxyapatite and poly(D,L-lactide-co-glycolide) nanoparticles for the local delivery of cholecalciferol",
pages = "943-950",
volume = "33",
number = "2",
doi = "10.1016/j.msec.2012.11.026",
url = "https://hdl.handle.net/21.15107/rcub_dais_15982"
}

Ignjatović, N., Uskoković, V., Ajduković, Z.,& Uskoković, D.. (2013). Multifunctional hydroxyapatite and poly(D,L-lactide-co-glycolide) nanoparticles for the local delivery of cholecalciferol. in Materials Science and Engineering: C, 33(2), 943-950.
https://doi.org/10.1016/j.msec.2012.11.026
https://hdl.handle.net/21.15107/rcub_dais_15982

Ignjatović N, Uskoković V, Ajduković Z, Uskoković D. Multifunctional hydroxyapatite and poly(D,L-lactide-co-glycolide) nanoparticles for the local delivery of cholecalciferol. in Materials Science and Engineering: C. 2013;33(2):943-950.
doi:10.1016/j.msec.2012.11.026
https://hdl.handle.net/21.15107/rcub_dais_15982 .

Ignjatović, Nenad, Uskoković, Vuk, Ajduković, Zorica, Uskoković, Dragan, "Multifunctional hydroxyapatite and poly(D,L-lactide-co-glycolide) nanoparticles for the local delivery of cholecalciferol" in Materials Science and Engineering: C, 33, no. 2 (2013):943-950,
https://doi.org/10.1016/j.msec.2012.11.026 .,
https://hdl.handle.net/21.15107/rcub_dais_15982 .

TY  - JOUR
AU  - Uskoković, Vuk
AU  - Hoover, Charles
AU  - Vukomanović, Marija
AU  - Uskoković, Dragan
AU  - Desai, Tejal A.
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/15989
AB  - Development of a material for simultaneous sustained and localized delivery of antibiotics and induction of spontaneous regeneration of hard tissues affected by osteomyelitis stands for an important clinical need. In this work, a comparative analysis of the bacterial and osteoblastic cell response to two different nanoparticulate carriers of clindamycin, an antibiotic commonly prescribed in the treatment of bone infection, one composed of calcium phosphate and the other comprising poly-(D,L-lactide-co-glycolide)-coated calcium phosphate, was carried out. Three different non-cytotoxic phases of calcium phosphate, exhibiting dissolution and drug release profiles in the range of one week to two months to one year, respectively, were included in the analysis: monetite, amorphous calcium phosphate and hydroxyapatite. Spherical morphologies and narrow size distribution of both types of nanopowders were confirmed in transmission and scanning electron microscopic analyses. The antibiotic-containing powders exhibited sustained drug release contingent upon the degradation rate of the carrier. Assessment of the antibacterial performance of the antibiotic-encapsulated powders against Staphylococcus aureus, the most common pathogen isolated from infected bone, yielded satisfactory results both in broths and on blood agar plates for all the analyzed powders. In contrast, no cytotoxic behavior was detected upon the incubation of the antibiotic powders with the osteoblastic MC3T3-E1 cell line for up to three weeks. The cells were shown to engage in a close contact with the antibiotic-containing particles, irrespective of their internal or surface phase composition, polymeric or mineral. At the same time, both types of particles upregulated the expression of osteogenic markers osteocalcin, osteopontin, Runx2 and protocollagen type I, suggesting their ability to promote osteogenesis and enhance remineralization of the infected site in addition to eliminating the bacterial source of infection.
T2  - Materials Science and Engineering: C
T1  - Osteogenic and Antimicrobial Nanoparticulate Calcium Phosphate and Poly-(D, L-Lactide-co-Glycolide) Powders for the Treatment of Osteomyelitis
SP  - 3362
EP  - 3373
VL  - 33
IS  - 6
DO  - 10.1016/j.msec.2013.04.023
UR  - https://hdl.handle.net/21.15107/rcub_dais_15989
ER  - 

@article{
author = "Uskoković, Vuk and Hoover, Charles and Vukomanović, Marija and Uskoković, Dragan and Desai, Tejal A.",
year = "2013",
abstract = "Development of a material for simultaneous sustained and localized delivery of antibiotics and induction of spontaneous regeneration of hard tissues affected by osteomyelitis stands for an important clinical need. In this work, a comparative analysis of the bacterial and osteoblastic cell response to two different nanoparticulate carriers of clindamycin, an antibiotic commonly prescribed in the treatment of bone infection, one composed of calcium phosphate and the other comprising poly-(D,L-lactide-co-glycolide)-coated calcium phosphate, was carried out. Three different non-cytotoxic phases of calcium phosphate, exhibiting dissolution and drug release profiles in the range of one week to two months to one year, respectively, were included in the analysis: monetite, amorphous calcium phosphate and hydroxyapatite. Spherical morphologies and narrow size distribution of both types of nanopowders were confirmed in transmission and scanning electron microscopic analyses. The antibiotic-containing powders exhibited sustained drug release contingent upon the degradation rate of the carrier. Assessment of the antibacterial performance of the antibiotic-encapsulated powders against Staphylococcus aureus, the most common pathogen isolated from infected bone, yielded satisfactory results both in broths and on blood agar plates for all the analyzed powders. In contrast, no cytotoxic behavior was detected upon the incubation of the antibiotic powders with the osteoblastic MC3T3-E1 cell line for up to three weeks. The cells were shown to engage in a close contact with the antibiotic-containing particles, irrespective of their internal or surface phase composition, polymeric or mineral. At the same time, both types of particles upregulated the expression of osteogenic markers osteocalcin, osteopontin, Runx2 and protocollagen type I, suggesting their ability to promote osteogenesis and enhance remineralization of the infected site in addition to eliminating the bacterial source of infection.",
journal = "Materials Science and Engineering: C",
title = "Osteogenic and Antimicrobial Nanoparticulate Calcium Phosphate and Poly-(D, L-Lactide-co-Glycolide) Powders for the Treatment of Osteomyelitis",
pages = "3362-3373",
volume = "33",
number = "6",
doi = "10.1016/j.msec.2013.04.023",
url = "https://hdl.handle.net/21.15107/rcub_dais_15989"
}

Uskoković, V., Hoover, C., Vukomanović, M., Uskoković, D.,& Desai, T. A.. (2013). Osteogenic and Antimicrobial Nanoparticulate Calcium Phosphate and Poly-(D, L-Lactide-co-Glycolide) Powders for the Treatment of Osteomyelitis. in Materials Science and Engineering: C, 33(6), 3362-3373.
https://doi.org/10.1016/j.msec.2013.04.023
https://hdl.handle.net/21.15107/rcub_dais_15989

Uskoković V, Hoover C, Vukomanović M, Uskoković D, Desai TA. Osteogenic and Antimicrobial Nanoparticulate Calcium Phosphate and Poly-(D, L-Lactide-co-Glycolide) Powders for the Treatment of Osteomyelitis. in Materials Science and Engineering: C. 2013;33(6):3362-3373.
doi:10.1016/j.msec.2013.04.023
https://hdl.handle.net/21.15107/rcub_dais_15989 .

Uskoković, Vuk, Hoover, Charles, Vukomanović, Marija, Uskoković, Dragan, Desai, Tejal A., "Osteogenic and Antimicrobial Nanoparticulate Calcium Phosphate and Poly-(D, L-Lactide-co-Glycolide) Powders for the Treatment of Osteomyelitis" in Materials Science and Engineering: C, 33, no. 6 (2013):3362-3373,
https://doi.org/10.1016/j.msec.2013.04.023 .,
https://hdl.handle.net/21.15107/rcub_dais_15989 .

TY  - JOUR
AU  - Stevanović, Magdalena
AU  - Savanović, Igor
AU  - Uskoković, Vuk
AU  - Škapin, Srečo Davor
AU  - Bračko, Ines
AU  - Jovanović, Uroš
AU  - Uskoković, Dragan
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/487
AB  - A simple and green chemical method has been developed to synthesize stable bare and capped silver nanoparticles based on the reduction of silver ions by glucose and capping by poly(α,γ,l-glutamic acid) (PGA). The use of ammonia during synthesis was avoided. PGA has had a dual role in the synthesis and was used as a capping agent to make the silver nanoparticle more biocompatible and to protect the nanoparticles from agglomerating in the liquid medium. The synthesized PGA-capped silver nanoparticles in the size range 5–45 nm were stable over long periods of time, without signs of precipitation. Morphological examination has shown that the silver nanoparticles had a nearly spherical, multiply twinned structure. The effects of the reaction temperature and the reaction time during the synthesis were investigated too. The biocompatibility of the PGA-capped silver nanoparticles is discussed in terms of in vitro toxicity with human intestinal Caco-2 cells. The samples were characterized by UV–Visible spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and zeta potential measurements.
PB  - Springer-Verlag
T2  - Colloid and Polymer Science
T1  - A new, simple, green, and one-pot four-component synthesis of bare and poly(α,γ,l-glutamic acid)-capped silver nanoparticles
SP  - 221
EP  - 231
VL  - 290
IS  - 3
DO  - 10.1007/s00396-011-2540-7
UR  - https://hdl.handle.net/21.15107/rcub_dais_487
ER  - 

@article{
author = "Stevanović, Magdalena and Savanović, Igor and Uskoković, Vuk and Škapin, Srečo Davor and Bračko, Ines and Jovanović, Uroš and Uskoković, Dragan",
year = "2012",
abstract = "A simple and green chemical method has been developed to synthesize stable bare and capped silver nanoparticles based on the reduction of silver ions by glucose and capping by poly(α,γ,l-glutamic acid) (PGA). The use of ammonia during synthesis was avoided. PGA has had a dual role in the synthesis and was used as a capping agent to make the silver nanoparticle more biocompatible and to protect the nanoparticles from agglomerating in the liquid medium. The synthesized PGA-capped silver nanoparticles in the size range 5–45 nm were stable over long periods of time, without signs of precipitation. Morphological examination has shown that the silver nanoparticles had a nearly spherical, multiply twinned structure. The effects of the reaction temperature and the reaction time during the synthesis were investigated too. The biocompatibility of the PGA-capped silver nanoparticles is discussed in terms of in vitro toxicity with human intestinal Caco-2 cells. The samples were characterized by UV–Visible spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and zeta potential measurements.",
publisher = "Springer-Verlag",
journal = "Colloid and Polymer Science",
title = "A new, simple, green, and one-pot four-component synthesis of bare and poly(α,γ,l-glutamic acid)-capped silver nanoparticles",
pages = "221-231",
volume = "290",
number = "3",
doi = "10.1007/s00396-011-2540-7",
url = "https://hdl.handle.net/21.15107/rcub_dais_487"
}

Stevanović, M., Savanović, I., Uskoković, V., Škapin, S. D., Bračko, I., Jovanović, U.,& Uskoković, D.. (2012). A new, simple, green, and one-pot four-component synthesis of bare and poly(α,γ,l-glutamic acid)-capped silver nanoparticles. in Colloid and Polymer Science
Springer-Verlag., 290(3), 221-231.
https://doi.org/10.1007/s00396-011-2540-7
https://hdl.handle.net/21.15107/rcub_dais_487

Stevanović M, Savanović I, Uskoković V, Škapin SD, Bračko I, Jovanović U, Uskoković D. A new, simple, green, and one-pot four-component synthesis of bare and poly(α,γ,l-glutamic acid)-capped silver nanoparticles. in Colloid and Polymer Science. 2012;290(3):221-231.
doi:10.1007/s00396-011-2540-7
https://hdl.handle.net/21.15107/rcub_dais_487 .

Stevanović, Magdalena, Savanović, Igor, Uskoković, Vuk, Škapin, Srečo Davor, Bračko, Ines, Jovanović, Uroš, Uskoković, Dragan, "A new, simple, green, and one-pot four-component synthesis of bare and poly(α,γ,l-glutamic acid)-capped silver nanoparticles" in Colloid and Polymer Science, 290, no. 3 (2012):221-231,
https://doi.org/10.1007/s00396-011-2540-7 .,
https://hdl.handle.net/21.15107/rcub_dais_487 .

TY  - JOUR
AU  - Stevanović, Magdalena
AU  - Savanović, Igor
AU  - Uskoković, Vuk
AU  - Škapin, Srečo Davor
AU  - Bračko, Ines
AU  - Jovanović, Uroš
AU  - Uskoković, Dragan
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/571
AB  - A simple and green chemical method has been developed to synthesize stable bare and capped silver nanoparticles based on the reduction of silver ions by glucose and capping by poly(α,γ,L-glutamic acid) (PGA). The use of ammonia during synthesis was avoided. PGA has had a dual role in the synthesis and was used as a capping agent to make the silver nanoparticle more biocompatible and to protect the nanoparticles from agglomerating in the liquid medium. The synthesized PGA-capped silver nanoparticles in the size range 5–45 nm were stable over long periods of time, without signs of precipitation. Morphological examination has shown that the silver nanoparticles had a nearly spherical, multiply twinned structure. The effects of the reaction temperature and the reaction time during the synthesis were investigated too. The biocompatibility of the PGA-capped silver nano-particles is discussed in terms of in vitro toxicity with human intestinal Caco-2 cells. The samples were characterized by UV–Visible spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and zeta potential measurements.
PB  - Springer-Verlag
T2  - Colloid and Polymer Science
T1  - A new, simple, green, and one-pot four-component synthesis of bare and poly(α,γ, L-glutamic acid)-capped silver nanoparticles
SP  - 221
EP  - 231
VL  - 290
IS  - 3
DO  - 10.1007/s00396-011-2540-7
UR  - https://hdl.handle.net/21.15107/rcub_dais_571
ER  - 

@article{
author = "Stevanović, Magdalena and Savanović, Igor and Uskoković, Vuk and Škapin, Srečo Davor and Bračko, Ines and Jovanović, Uroš and Uskoković, Dragan",
year = "2012",
abstract = "A simple and green chemical method has been developed to synthesize stable bare and capped silver nanoparticles based on the reduction of silver ions by glucose and capping by poly(α,γ,L-glutamic acid) (PGA). The use of ammonia during synthesis was avoided. PGA has had a dual role in the synthesis and was used as a capping agent to make the silver nanoparticle more biocompatible and to protect the nanoparticles from agglomerating in the liquid medium. The synthesized PGA-capped silver nanoparticles in the size range 5–45 nm were stable over long periods of time, without signs of precipitation. Morphological examination has shown that the silver nanoparticles had a nearly spherical, multiply twinned structure. The effects of the reaction temperature and the reaction time during the synthesis were investigated too. The biocompatibility of the PGA-capped silver nano-particles is discussed in terms of in vitro toxicity with human intestinal Caco-2 cells. The samples were characterized by UV–Visible spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and zeta potential measurements.",
publisher = "Springer-Verlag",
journal = "Colloid and Polymer Science",
title = "A new, simple, green, and one-pot four-component synthesis of bare and poly(α,γ, L-glutamic acid)-capped silver nanoparticles",
pages = "221-231",
volume = "290",
number = "3",
doi = "10.1007/s00396-011-2540-7",
url = "https://hdl.handle.net/21.15107/rcub_dais_571"
}

Stevanović, M., Savanović, I., Uskoković, V., Škapin, S. D., Bračko, I., Jovanović, U.,& Uskoković, D.. (2012). A new, simple, green, and one-pot four-component synthesis of bare and poly(α,γ, L-glutamic acid)-capped silver nanoparticles. in Colloid and Polymer Science
Springer-Verlag., 290(3), 221-231.
https://doi.org/10.1007/s00396-011-2540-7
https://hdl.handle.net/21.15107/rcub_dais_571

Stevanović M, Savanović I, Uskoković V, Škapin SD, Bračko I, Jovanović U, Uskoković D. A new, simple, green, and one-pot four-component synthesis of bare and poly(α,γ, L-glutamic acid)-capped silver nanoparticles. in Colloid and Polymer Science. 2012;290(3):221-231.
doi:10.1007/s00396-011-2540-7
https://hdl.handle.net/21.15107/rcub_dais_571 .

Stevanović, Magdalena, Savanović, Igor, Uskoković, Vuk, Škapin, Srečo Davor, Bračko, Ines, Jovanović, Uroš, Uskoković, Dragan, "A new, simple, green, and one-pot four-component synthesis of bare and poly(α,γ, L-glutamic acid)-capped silver nanoparticles" in Colloid and Polymer Science, 290, no. 3 (2012):221-231,
https://doi.org/10.1007/s00396-011-2540-7 .,
https://hdl.handle.net/21.15107/rcub_dais_571 .