Simultaneous determination of sixteen ginsenosides in Panax ginseng and its preparation by HPLC Chemical constituents from roots and rhizomes of Panax ginseng cultivated in Jilin province Chemical constituents of saponins from leaves of Camellia euphlebia Chemical constituents of saponins from leaves of Camellia euphlebia Studies on the Minor Saponins from Leaves of Panax ginseng C.A.Meyer Studies on the Different Characteristic Ginsenoside in Ginseng (Panax ginseng) and American Ginseng (Panax quinquefolius) by TLC-scanning