Study on Steroidal Saponins of Dioscorea septemloba Thunb

Objective: To isolate and identify steroidal saponins from the rhizomes of Dioscorea septemloba Thunb.Methods: The compounds were isolated by solvent extraction,column chromatography on silica gel and ODS,and their strctures were elucidated on the base of chemical and spectral analyses.Results: Three steroidal saponins were isolated from the rhizomes of Dioscorea septemloba Thunb,and their structures were detemined as dioscin(Ⅰ),protodioscin(Ⅱ),protogracillin(Ⅲ).Conclusion: Compound Ⅱ and Ⅲ were obtained from the rhizomes of Dioscorea septemloba Thunb for the first time.