为了控制紫黄止血散的质量，对其中的黄连进行了薄层层析鉴别，对其中大黄中的大黄素建立了反相液相色谱测定方法。结果显示，其鉴别项下的阴性对照品无干扰，含量测定法的灵敏度高，重视性好，平均回收率为99.24%，RSD为1.21%。

Zihuang Haemostat powder(ZHP)is a Chinese traditional patent medicine. Its ingredient Coptis chinenses Franch was identified by TLC. A Rp-HPLC method for detrmining emodin in ZHP was established. The TLC method was not interfered by blank sample. The Rp-HPLC method was sensitive and highly reproducible. Its average recovery was 99. 24%. RSD was 1. 21 %.