5-氟尿嘧啶聚乳酸缓释片的处方筛选及体外释药机制研究
发布时间:2018-11-26 07:09
【摘要】:目的:筛选5-氟尿嘧啶(5-FU)聚乳酸(PLA)缓释片(5-FU-PLA-DS)的处方,研究其体外释药机制。方法:采用紫外分光光度法测定释放介质中5-FU含量,以模拟体液为释放介质,于37℃水浴中进行体外释放试验。以分子量分别为3 000、6 000、10 000、15 000和20 000的PLA,制备载药量分别为1.5、2.5、3.0 mg/片,直径3.0 mm、厚1.0 mm的15种圆形5-FU-PLA-DS;以有效浓度持续释放时间与累积释放度为指标,筛选最优处方。采用扫描电镜观察5-FU-PLA-DS释药后的形态,评价其释药机制。结果:最优处方中PLA的分子量为20 000,载药量为3.0 mg/片;所制5-FU-PLA-DS可释放119 d,累积释放度为100.63%,有效浓度持续释放91 d。扫描电镜观察显示,5-FU-PLA-DS表面的微球最先接触释放介质而进行蚀解、释放药物,待外层的微球和微球之间的PLA降解后才逐渐暴露出内层的微球进行释药,其释药机制主要为溶蚀和扩散。结论:成功制得5-FU-PLA-DS,其有效浓度持续释放时间长,能够由外向内有步骤地降解,实现不同层次微球的非同步释药。
[Abstract]:Aim: to study the mechanism of 5-fluorouracil (5-FU) polylactic acid (PLA) sustained-release tablets (5-FU-PLA-DS) in vitro. Methods: the content of 5-FU in release medium was determined by ultraviolet spectrophotometry. The release test was carried out in 37 鈩,
本文编号:2357735
[Abstract]:Aim: to study the mechanism of 5-fluorouracil (5-FU) polylactic acid (PLA) sustained-release tablets (5-FU-PLA-DS) in vitro. Methods: the content of 5-FU in release medium was determined by ultraviolet spectrophotometry. The release test was carried out in 37 鈩,
本文编号:2357735
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