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采用薄层扫描法测定乙肝清热解毒胶囊中大黄素的含量，硅胶G－CMC板，甲苯一醋酸乙酯一甲酸（15：2：1）上层溶液为展开剂，λ=440nm，λR=650nm，外标一点法定量。平均回收率96.5％，RSD=22％。结果每粒胶囊大黄素含量平均为0．017mg。
TLC scanning was used to determine the content of emodin in BJHJ capsules. The silica gel G-CMC plate and toluene-ethyl acetate-formic acid (15:2:1) upper layer solution were used as the developer, and λ=440 nm, λR=650 nm. External standard point method. The average recovery rate was 96.5%, and the RSD was 22%. The average emodin content per capsule was 0.017 mg.