邦産ヤマノイモ科植物のサポニンに就いて (第2報)

ウチワドコロ, タチドコロ及びヒメドコロの水不溶性サポニン

抄録

Water-insoluble steroidal saponins were isolated from the methanolic extracts of the powdered rhizome of Dioscorea nipponica Makino, D. gracillima Miq., and D. tenuipes Franch. et Sav. Purification of these saponins by liquid chromatography through alumina yielded the same chief component from the portion eluted with a chloroform-methanol (5:1) mixture. The substance and its acetate showed the same properties, such as the melting point, specific roatation, and others, with pure dioscin obtained by the similar purification of a sample of dioscin, a water-insoluble saponin isolated from D. tokoro Makino and its acetate. All these four samples were found to form diosgenin, glucose, and rhamnose by hydrolysis. It has thereby been clarified that the chief component of the water-insoluble saponins contained in the foregoing three domestic Dioscoreaceae plants is dioscin.