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用薄层层析-紫外分光光度法测定止痢丸中没食子酸的含量，测定波长272um，在2～20μg／ml范围内呈良好线性关系，C＝0．051A—0．003（r＝0．997），回收率为99．92％（RSD＝2．87％）。
TLC-UV spectrophotometry was used to determine the content of gallic acid in Zhizhi Pills. The measurement wavelength was 272um and the linear relationship was good in the range of 2-20μg/ml. C=0.051A-0.003(r=0) .997) The recovery rate was 99.92% (RSD = 2.87%).