J Integr Plant Biol. ›› 2007, Vol. 49 ›› Issue (2): -.DOI: 10.1111/j.1744-7909.2007.00362.x

• Stress & Phytochemistry •    

Two New Triterpenoid Saponins from Akebia quinata (Thunb.) Decne.

Gui-Yan Liu, Shuang-Cheng Ma, Jian Zheng, Ji Zhang and Rui-Chao Lin   

Abstract: Two new triterpenoid saponins, hederagenin 3-O-α-L-arabinopyranosyl-(1→2)-α-L-arabinopyranoside named akeboside La (compound 1), oleanolic acid 3-O-α-L-arabinopyranosyl-(1→2)-β-D-glucopyranoside named akeboside Lb (compound 2), along with five known saponins, oleanolic acid 3-O-α-L-rhamnopyranosyl-(1→2)-α-Larabinopyranoside (compound 3), hederagenin 3-O-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranoside (compound 4), oleanolic acid 3-O-β-D-xylopyranosyl-(1→3)-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranoside (compound 5), 3-O-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranosyl oleanolic acid 28-O-α-L-rhamnopyranosyl-(1→4)-α-Dglucopyranosyl-( 1→6)-β-D-glucopyranoside (compound 6), 3-O-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranosyl hederagenin 28-O-α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranosyl-(1→6)-β-D-glucopyranoside (compound 7) were isolated from the n-butanol part of the 80% ethanol extracts of the dried stems of Akebia quinata (Thunb.) Decne. Compound 5 was isolated from plants of genus Akebia for the first time. The structures were elucidated on the basis of physicochemical properties and spectral data.

Key words: Akebia quinata, Lardizabalaceae, stem, triterpenoid saponin.

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