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Isolation and Indentification of Protosaponins from Fresh Rhizomes of Dioscorea zingiberensis Wright

作 者 ：Liu Cheng-lai and Chen Yan-yong

Keywords:Dioscorea zingiberensis Wright, Steroidal saponin, Protogracillin, Protozingiberensissaponin,

Abstract:Five steroidal chemical compounds were isolated from the fresh rhizomes of Dioseorea zingiberensis Wright gathered from Sichuan Province. Their chem ieal structures have been elucidated as diosgenin palmitate [Ⅰ]; β-sitosterol [Ⅱ]; gra- cillin [Ⅲ]; protogracillin [Ⅳ] and 3-O-{α-L-rhamnopyranosyl (1→3)-[β-D-glucopy- ranosyl (1→2)]-β-D-glucopyranosyl}-26-O-{β-D-glucopyranosyl}-diosgenin [Ⅴ]. [Ⅴ]is a new steroidal saponin, named protozingiberensissaponin.

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