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采用双波长薄层扫描法，对牛黄清肺散中黄芩苷的含量进行测定，在聚酰胺板上分离，以３６％醋酸－水（１０∶０．９）为展开剂，紫外灯下定位后测定含量，平均回收率１０１．３％．
Using double-wavelength thin-layer scanning method, the content of baicalin in bezoar Qingfei San was determined and separated on a polyamide plate with 36% acetic acid-water (10: 0.9) as developing solvent after UV lamp positioning Determination of content, the average recovery rate of 101.3%.