目的:对新种太白楤木(Aralia taibaiensis Z. Z. Wang et H. C. Zheng)根皮的皂苷成分继续进行研究。方法:利用硅胶柱层析和高效液相层析进行分离，根据皂苷的理化性质和光谱数据鉴定其结构。结果:得到3个化合物，分别确定为齐墩果酸-28- O-β-D_吡喃葡萄糖苷(Ⅰ)，3-O-β-D- 吡喃葡萄糖醛酸丁酯-齐墩果酸_28_O-βD-吡喃葡萄糖苷(Ⅱ)和3- O-β-D- 吡喃葡萄糖醛酸癸酯-齐墩果酸-28-O-β-D-吡喃葡萄糖苷( Ⅲ ) 。结论:皂苷Ⅱ和Ⅲ为新化合物，分别命名为太白楤木皂苷Ⅳ ( taibaienoside Ⅳ)和太白楤木皂普Ⅴ( taibaienoside Ⅴ) ,皂苷I为首次从该植物中分得。

OBJECTIVE:To investigate the saponin constituents of the root bark of Aralia taibaiensis, a new species.METHODS:Saponins were separated by HPLC and rechromatography on silica gel, whose structures were determined byspectral analysis and chemical evidence. RESULTS:Three saponins were obtained and elucidated as oleanolic acid-28-O-β-D-glucopyranoside(Ⅰ)，3- O-(6‘一O-butyl-β-D-glucuronopyranosyl)-oleanolic acid-28-O-β-D-glucopyranoside( Ⅱ)and 3-O-(6‘一O-decyl-β-D-glucuronopyranosyl)-oleanolic acid-28-O-β-D-glucopyra-noside( Ⅲ).CONCLUSION: Saponin I wasisolated from the plant for the first time. Ⅱ and Ⅲ are new compounds and named taibaienoside Ⅳ and taibaienoside Ⅴ，respectively.