title: [Research on carboxymethyl chitosan acting as the adjuvant for implantable degradable microspheres].
abstract: As a kind of biomaterial, carboxymethyl chitosan (CMC) has excellent biodegradable and bioacceptable capabilities using. This study was aimed to probe into the feasibility of CMC to prepare the implantable sustained release Ciprofloxacin Hydrochloride (CPX) microspheres(MS), and to go further into the pharmaceutic technology, the morphology and the characteristics of in vitro release of the microspheres. First, we prepared the microspheres by emulsification and cross-linking technology. Then, scanning electron microscopy (SEM), infrared spectrum (IR) and differential thermal analysis (DTA) were used to detect the structure and morphology of the MS. The in vitro release of CPX/CMC-MS and the CPX content of the MS were detected through continuous-flow releasing system. We found that the structure and morphology of the MS were affected by the conditions of preparation such as emulsification and cross-linking temperature, ionic strength and stirring speed, that the releasing time of CPX was more than 7 days, and that the releasing behaviors of the microspheres conformed to the Higuchi model. So we drew the conclusions that CMC could be used as a kind of absorbable and implantable adjuvant for sustained release, the technology of emulsification and cross-linking was proved to be feasible, stable and simple.
authors.affiliation: Department of Orthopaedics, Fuzhou General Hospital, Nanjing Military Command, Fuzhou 3250025, China.
authors.forename: Chenghui
authors.initials: C
authors.lastname: Yin
authors.forename: Chunlin
authors.initials: C
authors.lastname: Hou
authors.forename: Lixia
authors.initials: L
authors.lastname: Jiang
authors.forename: Qisheng
authors.initials: Q
authors.lastname: Gu
mesh_terms: D020341:Absorbable Implants; D001672:Biocompatible Materials; D001673:Biodegradation, Environmental; D002686:Chitin / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000493:pharmacokinetics; D048271:Chitosan; D002939:Ciprofloxacin / Q000008:administration & dosage / Q000493:pharmacokinetics; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D004337:Drug Carriers / Q000138:chemical synthesis; D006801:Humans; D008863:Microspheres
chemical_list: D001672:Biocompatible Materials; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D002686:Chitin; D002939:Ciprofloxacin; C068302:N-(carboxymethyl)chitosan; D048271:Chitosan