朝鲜白头翁的三萜皂苷成分研究

目的　研究朝鲜白头翁［Pulsatilla cernua(Thunb.) Bercht. et Opiz.］ 根茎的化学成分。 方法　朝鲜白头翁根茎的乙醇提取物经大孔树脂、硅胶、ODS柱以及HPLC分离得到6个化合物, 通过波谱(1H,¹³CNMR,FAB-MS等)分析和化学方法进行结构鉴定。结果　6个化合物分别被鉴定为pulsatilla saponin A(1), 常春藤皂苷元3-O-β-D-吡喃葡糖(1→3)-α-L-吡喃鼠李糖(1→2)-α-L-吡喃阿拉伯糖苷(2), pulsatilla saponin D(3), dipsacoside B(4), 3-O-α-L-吡喃鼠李糖(1→2)［β-D-吡喃葡糖(1→4)］-α-L-吡喃阿拉伯糖常春藤皂苷元28-O-β-D-吡喃葡糖酯苷(5)和胡萝卜苷(6)。 结论　5为新化合物, 命名为朝鲜白头翁丙苷(cernuoside C)。 2,4和6为首次从朝鲜白头翁中分离获得。

TRITERPENE SAPONINS FROM PULSATILLA CERNUA

AIM: To investigate the chemical constituents of the roots of Pulsatilla cernua (Thunb.) Bercht. et Opiz. METHODS: Column chromatography (including D101 macroporous resin, silica gel and ODS) and HPLC were used to separate the chemical constituents whose structures were elucidated by FAB-MS, NMR (1D and 2D) and hydrolysis methods. RESULTS: Six compounds were isolated and established as hederagenin 3-O-alpha-L-rhamnopyranosyl (1-->2)-alpha-L-arabinopyranoside (pulsatilla saponin A, 1), hederagenin 3-O-beta-D-glucopyranosyl (1-->3)-alpha-L-rhamnopyranosyl (1-->2)-alpha-L- arabinopyranoside (2), hederagenin' 3-O-alpha-L-rhamnopyranosyl(1-->2)[beta-D- glucopyranosyl(1-->4)]-alpha-L-arabinopyranoside (pulsatilla saponin D, 3), 3-O-alpha-L-rhamnopyranosyl (1-->2)-alpha-L-arabinopyranosyl hederagenin 28-O-beta-D-glucopyranosyl (1-->6)-beta-D-glucopyranosyl ester (dipsacoside B, 4), 3-O-alpha-L-rhamnopyranosyl(1-->2) [beta-D-glucopyranosyl(1-->4)]-alpha-L-arabinopyranosyl hederagenin 28-O-beta-D-glucopyranosyl ester (cernuoside C, 5) and daucosterol (6), respectively. CONCLUSION: Compound 5 is a new compound and named as cernuoside C. Compounds 2, 4 and 6 were isolated from Pulsatilla cernua for the first time.