目的对土贝母Bolbostemma paniculatum的三萜皂苷成分进行分离和结构鉴定。方法采用反复柱色谱方法进行分离, 通过理化性质和波谱分析鉴定结构。结果从土贝母中分离并鉴定了1个新的三萜皂苷脱木糖土贝母苷丙(dexylosyltubeimoside Ⅲ)。结论化合物为新化合物。

Objective To study the triterpenoid saponin from bulbs of Bolbostemma paniculatum.Methods The compound was isolated by repeated silica gel chromatographies and its strcuture was elucidated on the basis of physico chemical property and spectral analysis.Results A novel triterpenoid saponin was isolated and determined as olean 12-en-28 oic acid,3-{[2-O-[6-O-[(3R)-4-carboxy-3-hydroxy-3-methyl-1-oxobutyl]-β-D-glucopyranosyl]-β-D-glucopyranosy1]oxy}-2,16,23-trihydroxy-28-[2-O-α-L-rhamnose(1-2)-α-L-arabinopyranosyl]ester(IΦ.Conclusion Compound I is a novel compound named as dexylosyltubeimosideⅢ.