目的：比较退障凝胶与退障眼膏的体外释药特性，为研制退障凝胶提供依据。
Objective: to prepare Tuizhang gel to cure cataract, the characteristics of Tuizhang gel on the drug-releasing in vitro were evaluated by compared with Tuizhang oculentum.
方法：以高效液相色谱法测定释放介质中大黄素、大黄酚的含量，并以此为指标，采用透析法研究退障凝胶与退障眼膏的体外释放特性。
Method: The emodin and chrysophanol in the releasing mediator were determined by HPLC, and the drug releasing characteristics of Tuizhang gel and Tuizhang oculentum were studied by bag filter method.
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