Injectable gellan gum-based nanoparticles-loaded system for the local delivery of vancomycin in osteomyelitis treatment (original) (raw)
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International Journal of Nanomedicine, 2016
A local antibiotic delivery system (LADS) with biodegradable drug vehicles is recognized as the most effective therapeutic approach for the treatment of osteomyelitis. However, the design of a biodegradable LADS with high therapeutic efficacy is too costly and demanding. In this research, a low-cost, facile method was used to design vancomycin-loaded aragonite nanoparticles (VANPs) with the aim of understanding its potency in developing a nanoantibiotic bone implant for the treatment of osteomyelitis. The aragonite nanoparticles (ANPs) were synthesized from cockle shells by a hydrothermal approach using a zwitterionic surfactant. VANPs were prepared using antibiotic ratios of several nanoparticles, and the formulation (1:4) with the highest drug-loading efficiency (54.05%) was used for physicochemical, in vitro drug release, and biological evaluation. Physiochemical characterization of VANP was performed by using transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, and Zetasizer. No significant differences were observed between VANP and ANP in terms of size and morphology as both samples were cubic shaped with sizes of approximately 35 nm. The Fourier transform infrared spectroscopy of VANP indicated a weak noncovalent interaction between ANP and vancomycin, while the zeta potential values were slightly increased from −19.4±3.3 to −21.2±5.7 mV after vancomycin loading. VANP displayed 120 hours (5 days) release profile of vancomycin that exhibited high antibacterial effect against methicillin-resistant Staphylococcus aureus ATCC 29213. The cell proliferation assay showed 80% cell viability of human fetal osteoblast cell line 1.19 treated with the highest concentration of VANP (250 µg/mL), indicating good biocompatibility of VANP. In summary, VANP is a potential formulation for the development of an LADS against osteomyelitis with optimal antibacterial efficacy, good bone resorbability, and biocompatibility.
Fibers and Polymers, 2019
In this study, it was aimed to develop drug eluting biodegradable and biocompatible bone supportive fibers and films, which can locally be applicable on the infected bone defect area for osteomyelitis treatment. For this purpose, vancomycin (Vm) loaded gelatin (G) microspheres were prepared and dispersed into poly(ε-caprolactone) (PCL) solution and then the suspension was processed as films and fibers by solvent casting and wet spinning techniques, respectively. The mean particle size distribution and morphology of Vm loaded G microspheres were characterized by laser diffraction method and scanning electron microscopy, respectively. In vitro Vm release profiles and release kinetics from microsphere, fiber and film formulations were investigated. In vitro biodegradation properties of fiber and film formulations were examined in both hydrolytic and enzymatic media during 25 days period. The cytotoxicity of Vm eluting films and fibers were tested on L929 cells by MTT assay. Presence of PCL in film and fiber formulations retarded the release of Vm from microspheres and provided long term sustained release. Vm eluting films and fibers exhibited strong antibacterial properties against Staphylococcus aureus and Staphylococcus epidermidis.