复合头孢曲松钠和BMP的壳聚糖抗菌成骨生物陶瓷的制备实验研究

目的 使用壳聚糖和磷酸钙骨水泥(CPC)复合头孢曲松钠和BMP,制备出一种具有成骨和抗感染作用的植骨材料.方法 使用不同成分和比例的壳聚糖固化液将磷酸钙骨水泥、头孢曲松钠和BMP共混制备抗菌成骨生物陶瓷,绘制头孢曲松钠的紫外吸光度-浓度标准直线,测定生物陶瓷中头孢曲松钠体外释放浓度.微生物法测定生物陶瓷体外抑菌效果.生物陶瓷埋于大鼠腿部肌袋研究其成骨性能.将生物陶瓷填充大鼠污染骨缺损模型,研究其抑菌和成骨作用.结果 生物陶瓷的优化制备方案为0.1 g磷酸钙骨水泥复合10.4 mg头孢曲松钠和0.5 mg BMP与2.4 ml同化液C混合后在60℃、100%湿度下固化24 h.该生物陶瓷体外释放稳定,微生物测定结果表明头孢曲松钠在体外释放持续1周高于金黄色葡萄球菌最小抑菌浓度,达到了局部抗菌效果,组织切片显示8周后埋于大鼠腿部肌袋的生物陶瓷周围有骨组织产生,污染骨缺损实验中白细胞计数和组织切片显示实验组较对照组炎症反应轻微,成骨显著.结论 复合头孢曲松钠、壳聚糖和BMP的抗菌成骨生物陶瓷有望成为治疗污染性骨缺损的理想材料.

Antimicrobiai bioceramic combined with chitosan and ceftriaxone sodium:Preparation and its in vitro and in vivo study

Objective To synthesize antimicrobial bioceramic using chitosan and calcium phosphate cements mixed with ceftriaxone sodium. Methods The bioceramic was synthesized through the hardening of chitosan liquid combined with calcium phosphate cements and cefiriaxone sodium.The released ceftriaxone sodium was studied according to the linear equation between UV-VIS absorbance to concentration.The in vitro bactefiostatic effect of the chosen bioceramic was investigated via the microbiological method.The model of rats'contaminated bone defect were deployed to study the antimicrobial performance of the bioceramic. Results The best synthesis condition was chosen at:0.1g calcium phosphate cements and 10.4 mg ceftriaxone sodium combined with 2.4 ml hardening liquid C.then keeping the mixture at 60℃ and 100%humidity for 24 h.In vitro release of the resulting antimicrobial bioceramic remained stable,while that of ceftriaxone sodium lasted for a week,higher than the minimal inhibitory concentration(MIC) of Staphylococcus aureus.As proved by the WBC number and tissue sectioning,a lighter inflammatory response of treatment group was observed as compared with the control group. Conclusion The antimicrobial bioceramic combined with chitosan and ceftriaxone sodium shows promising antimicrobial performance.