Two New Steroidal Glycosides from Fermented Leaves of Agave americana

Two new spirostanol glycosides named agamenoside A and B, were isolated from the fermented leaves of Agave americana. Their structures were elucidated as (23S, 25R)-5a -spirostan-3b, 6a, 23-triol 3-O-a-L-rhamnopyranosyl-(13)- b-D-glucopyranosyl-(12)-[b-D- xylopyranosyl-(13)]-b-D-glucopyranosyl-(14)-b-D-galactopyranoside (1) and (25R)-5a-spiro- stan-3b, 6a-diol 3-O-b-D-glucopyranosyl-(12)-[ b-D-xylopyranosyl-(13)]- b-D-glucopyra- nosyl-(14)- b-D-galactopyranoside (2) by a combination of chemical and spectral methods.

龙舌兰发酵叶汁中一个新的C_(27)甾体皂苷

目的 :对龙舌兰发酵叶汁的化学成分进行研究 ,寻找新的活性物质。方法 :利用正反相硅胶柱色谱分离 ,根据化合物的理化性质和光谱数据鉴定结构。结果 :分离并鉴定了 3个甾体化合物 ,确定其结构为 (2 5R) 5α 螺甾烷 3β ,6α ,2 3α 三醇 6 O β D 吡喃葡萄糖苷 (1) ,(2 5R) 5α 螺甾烷 3β ,6α ,2 3α 三醇 3,6 二 O β D 吡喃葡萄糖苷 (cantalasaponin 1) (2 )和 (2 5R) 5α 螺甾烷 3β ,6α,2 3α 三醇 (红光皂苷元 ) (3)。 结论 :化合物 1为一新化合物 ,命名为龙舌兰苷C。