Cevher, ErdalOrhan, ZaferMulazimoğlu, LütfiyeŞensoy, DemetAlper, MuratYıldız, AyçaÖzsoy, Yıldız2021-06-232021-06-2320060378-51731873-3476https://doi.org/10.1016/j.ijpharm.2006.03.014https://hdl.handle.net/20.500.12491/5855The biodegradable chitosan microspheres containing vancomycin hydrochloride (VANCO) were prepared by spray drying method with different polymer:drug ratios ( 1: 1, 2:1, 3:1 and 4: 1). Thermal behaviour, particle size and distribution, morphological characteristics, drug content, encapsulation efficiency, in vitro release assessments of formulations have been carried out to obtain suitable formulation which shows sustained-release effect when implanted. Sterilized VANCO loaded microspheres were implanted to proximal tibia of rats with methicillin-resistant Staphylococcus aureus (MRSA) osteomyelitis. Intramuscular (IM) injection of VANCO for 21 days was applied to another group for comparison. After 3 weeks of treatment, bone samples were analysed with a microbiological assay. According to the results, encapsulation efficiency and yield of microspheres in all formulations were higher than 98% and 47%, respectively. Particle sizes of microspheres were smaller than 6 mu m. All microsphere formulations have shown sustained-release effect. In vitro drug release rate decreased due to the increase in polymer:drug ratio but no significant difference was seen between these results (p > 0.05). Based on our in vivo data, rats implanted VANCO-loaded chitosan inicrospheres and administered IM injection showed 3354 3366 and 52500 25635 colony forming, unit of MRSA in 1g bone samples (CFU/g), respectively. As a result, implanted VANCO-loaded microspheres were found to be more effective than IM route for the treatment of experimental osteomyelitis.eninfo:eu-repo/semantics/closedAccessVancomycinBiodegradable MicrospheresChitosanSpray Drying MethodMethicillin-resistant Staphylococcus AureusExperimental OsteomyelitisArticle10.1016/j.ijpharm.2006.03.0143172127135166245092-s2.0-33745222792Q1WOS:000239293400004Q2