Saponins and other constituents from the leaves of Aralia elata

초록

A new triterpenoid saponin, together with five known saponins, were isolated from the nonpolar n-hexane fraction of the leaves of Aralia elata. The structure of the new saponin, durupcoside C, was elucidated as hederagenin 3-O-beta-D-glucopyranosyl (1 -> 3)-beta-D-glucopyranosyl (1 -> 3)-alpha-L-arabinopyranoside on the basis of spectroscopic analysis. The known saponins were characterized as 3-O-alpha-L-rhamnopyranosyl(1 -> 2)-alpha-L-arabinopyranosyl hederagenin 28-O-beta-D-Xylopyranosyl(1 -> 6)-beta-D-glucopyranosyl ester, hederagenin 3-O-beta-D-glucopyranosyl(1 -> 3)-alpha -L-rhamnopyranosyl(1 -> 2)-alpha-L-arabinopyranoside, oleanolic acid 3-O-beta-D-glucopyranosyl(1 -> 3)alpha -L-rhamnopyranosyl(1 -> 2)-alpha-L-arabinopyranoside, hederagenin 3-O-alpha-L-rhamnopyranosyl(1 -> 2)-alpha-L-arabinopyranoside (alpha-hederin), and hederagenin 3-O-0 beta-D-glueopyranosyl(1 -> 3)-alpha-L-arabinopyranoside (collinsonidin). In addition, two known lipids, Arisaema glyceride 3 and ceramide mixtures were also isolated and characterized. Collinsonidin and two known lipids were isolated for the first time from this plant.

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