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Full-Text Articles in Nanotechnology
In Vitro Analysis Of Nanoparticulate Hydroxyapatite/Chitosan Composites As Potential Drug Delivery Platforms For The Sustained Release Of Antibiotics In The Treatment Of Osteomyelitis, Vuk Uskoković, Tejal A. Dasai
In Vitro Analysis Of Nanoparticulate Hydroxyapatite/Chitosan Composites As Potential Drug Delivery Platforms For The Sustained Release Of Antibiotics In The Treatment Of Osteomyelitis, Vuk Uskoković, Tejal A. Dasai
Pharmacy Faculty Articles and Research
Nanoparticulate composites of hydroxyapatite (HAp) and chitosan were synthesized by ultrasound-assisted sequential precipitation and characterized for their microstructure at the atomic scale, surface charge, drug release properties, and combined antibacterial and osteogenic response. Crystallinity of HAp nanoparticles was reduced because of the interference of the surface layers of chitosan with the dissolution/reprecipitation-mediated recrystallization mechanism that conditions the transition from the as-precipitated amorphous calcium phosphate phase to the most thermodynamically stable one—HAp. Embedment of 5–10 nm sized, narrowly dispersed HAp nanoparticles within the polymeric matrix mitigated the burst release of the small molecule model drug, fluorescein, bound to HAp by physisorption, …
Simultaneous Bactericidal And Osteogenic Effect Of Nanoparticulate Calcium Phosphate Powders Loaded With Clindamycin On Osteoblasts Infected With Staphylococcus Aureus, Vuk Uskoković, Tejal A. Dasai
Simultaneous Bactericidal And Osteogenic Effect Of Nanoparticulate Calcium Phosphate Powders Loaded With Clindamycin On Osteoblasts Infected With Staphylococcus Aureus, Vuk Uskoković, Tejal A. Dasai
Pharmacy Faculty Articles and Research
S aureus internalized by bone cells and shielded from the immune system provides a reservoir of bacteria in recurring osteomyelitis. Its targeting by the antibiotic therapy may thus be more relevant for treating chronic bone infection than eliminating only the pathogens colonizing the bone matrix. Assessed was the combined osteogenic and antibacterial effect of clindamycinloaded calcium phosphate nanoparticles of different monophasic compositions on co-cultures comprising osteoblasts infected with S aureus. Antibiotic-carrying particles were internalized by osteoblasts and minimized the concentration of intracellular bacteria. In vitro treatments of the infected cells, however, could not prevent cell necrosis due to the …
Phase Composition Control Of Calcium Phosphate Nanoparticles For Tunable Drug Delivery Kinetics And Treatment Of Osteomyelitis. Part 2: Antibacterial And Osteoblastic Response, Vuk Uskoković, Tejal A. Dasai
Phase Composition Control Of Calcium Phosphate Nanoparticles For Tunable Drug Delivery Kinetics And Treatment Of Osteomyelitis. Part 2: Antibacterial And Osteoblastic Response, Vuk Uskoković, Tejal A. Dasai
Pharmacy Faculty Articles and Research
Osteomyelitis has been traditionally treated by the combination of long-term antibiotic therapies and surgical removal of diseased tissue. The multifunctional material was developed in this study with the aim to improve this therapeutic approach by: (a) enabling locally delivered and sustained release of antibiotics at a tunable rate, so as to eliminate the need for repetitive administration of systemically distributed antibiotics; and (b) controllably dissolving itself, so as to promote natural remineralization of the portion of bone lost to disease. We report hereby on the effect of the previously synthesized calcium phosphates (CAPs) with tunable solubilities and drug release time …
Multifunctional Hydroxyapatite And Poly(D,L-Lactide-Co-Glycolide) Nanoparticles For The Local Delivery Of Cholecalciferol, Nenad Ignjatović, Vuk Uskoković, Zorica Ajduković, Dragan Uskoković
Multifunctional Hydroxyapatite And Poly(D,L-Lactide-Co-Glycolide) Nanoparticles For The Local Delivery Of Cholecalciferol, Nenad Ignjatović, Vuk Uskoković, Zorica Ajduković, Dragan Uskoković
Pharmacy Faculty Articles and Research
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 …