[1]School of Pharmacy Shandong University of Traditional Chinese Medicine Jinan 250355 China;
[2]Shandong Key Laboratory of TCM Quality Control Technology Shandong Analysis and Test Center Jinan 250014 China;
[3]Jinan Sanfeng Biological Pharmacy Co. Ltd. Jinan 250014 China;
Silica gel column chromatography; High-speed counter-current chromatography(HSCCC); Acetophenones; Cynanchum bengei Decne root bark;