本文对江西庐山的粉背薯蓣进行甾体皂甙的分离鉴定,从根茎中分到两个约姆皂甙元的甾体皂甙(A 和 C)。通过乙酰化、酸水解、酶解、红外光谱、质谱、碳谱等鉴定,皂甙 A为新皂甙,结构式推断为约姆皂甙元-3-O-[双-α-L-鼠李吡喃糖(1→2,1→3)]-β-D-葡萄吡喃糖甙,命名为粉背皂甙 A(hypoglaucine A);C 为原粉背皂甙 A(protohypoglaucine A)。 In this paper, the separation and identification of saponin from the backside of Dioscorea zingiberensis in Lushan, Jiangxi province, were separated from the roots into two saponins (A and C) of saponins. Identification by acetylation, acid hydrolysis, enzymolysis, infrared spectroscopy, mass spectrometry, and carbon spectroscopy, saponin A is a novel saponin, and the structural formula is deduced to be saponins-3-O-[bis-α-L-rhampyranose]. (1→2,1→3)]-β-D-pyranoside, named hypoglaucine A; C is protohypoglaucine A.