以芦丁为标准品 ,采用紫外分光光度法 ,对用乙基纤维素等辅料制备的缓释片和用淀粉等辅料制备的银杏叶普通片 ,进行了银杏总黄酮含量测定和体外累积释药百分率的比较 .普通片的体外释药动力学为一级释放 ,缓释片在 2～ 1 2 h为零级释放 ,普通片释放 50 %的时间为 66min,缓释片释放 50 %的时间为 1 1 2 min,缓释片体外释药速率明显慢于普通片 Rutin was used as a standard sample and UV spectrophotometry was used to determine the content of total flavonoids in Ginkgo biloba and the cumulative release in vitro by using the sustained-release tablets prepared with ethyl cellulose and other materials. The percentage release rate of common tablets in vitro was first order release, sustained release tablets were zero-order release in 2 ~ 1 2 h, release time of 50% in common tablets was 66min, release time in tablets was 50% 1 1 2 min, sustained-release tablets in vitro release rate was significantly slower than ordinary tablets