Abstract
Three new spirostanol steroidal oligoglycosides, together with a known oligoglycoside, were obtained from the seeds of Allium tuberosum after enzymatic hydrolysis of furostanol saponin fraction by β-glucosidase. On the basis of spectroscopic analysis, the structure of new spirostanol oligoglycosides were elucidated as (25S)-spirost-5-ene-2α, 3β-diol 3-O-α-L-rhamnopyranosyl-(1→4)-[α-L-rhamnopyranosyl)-(1→2)]-β-D-glucopyranoside, (25S)-spirostane-3β, 5β, 6α-triol 3-O-α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranoside, and (25S)-5β-spirostane-3β, 6α-diol 3-O-α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranoside.
