Alkaloids from Dactylicapnos scandens Hutch. Investigation on structure of protopine alkaloid ion-pair compounds Progress in studies on pharmacological effect of Protopine Determination of protopine and isocorydine in root of Dactylicapnos scandens by HPLC Quality control for alkaloids of Corydalis Rhizoma based on quantitative analysis on multi-components with single marker Simultaneous determination of seven alkaloids in Cuyanhusuo Granule by RP-HPLC Purification of Rhizoma Corydalis Decumbentis total alkaloids by ultrafiltration membrane technology Determination of protopine in Corydalis racemose by HPLC