Qualitative and quanlitative standard of Dangshi capsules

Objective To establish a qualitative and quanlitative standard for Dangshi capsules. Methods Pyrrosiae folium, Cirsii herba and Glycyrrhizae radix et rhizome in Dangshi capsules were identified by TLC. To develop an HPLC method to determine the content of chlorogenic acid in Dangshi capsule, C 18 column was used. The mobile phase consisted of methanol-acetonitrile-0.05% phosphoric acid solution(5 :5 :90). The UV detection wavelength was 327 nm. Results The spots on TLC plates were clear with no interference. There was a good linearity when the concentration of chlorogenic acid was at 0.072- 0.720 μg(r = 0.999 7). The average recovery was 99.1%, RSD = 0.52%(n = 6). Conclusion The method is simple, accurate and reproducible.