Two free triterpenoids and twelve triterpenoid saponins were isolated from the fresh pericarps of Akebia quinata DECNE. (Lardizabalaceae). Ten saponins, P
A-G, P
J2, P
J3 and P
K, of the above twelve were characterized as follows : P
A (I), hederagenin (hederag.) 3-O-α-L-ara·pyranoside ; P
F (II), hederag. 3-O-β-D-glc·pyr-(1→2)-α-L-ara·pyranoside ; P
B (III), oleanolic acid (ol. acid) 3-O-α-L-rha·pyr-(1→2)-α-L-ara·pyranoside ; Pc (VI), hederag. 3-O-β-D-xyl·pyr-(1→3)-α-L-ara·pyranoside ; P
D (IX), hederag. 3-O-α-L-rha·pyr-(1→2)-α-L-ara·pyranoside ; P
E (XI), ol, acid 3-O-β-D-glc·pyr-(1→2)-α-L-ara·pyranoside ; P
G (XIII), hederag. 3-O-β-D-xyl·pyr-(1→3)-α-L-rha·pyr-(1→2)-α-L-ara·pyranoside ; P
Jz (XV') 3-O-α-L-ara·pyranosyl-hederag. 28-O-α-L-rha·pyr-(1→4)-β-D-glc·pyr-(1→6)-β-D-glc·pyranoside ; P
Js (XIX'), 3-O-α-L-rha·pyr-(1→2)-α-L-ara·pyranosyl-ol. acid 28-O-α-L-rha·pyr-(1→4)-β-D-glc·pyr-(1→6)-β-D-glc·pyranoside ; P
K (XXI), 3-O-α-L-rha·pyr-(1→2)-α-L-ara·pyranosyl-hederag. 28-O-α-L-rha·pyr-(1→4)-β-D-glc·pyr-(1→6)-β-D-glc·pyranoside. VI, XI and XV'are new members of the group of hederagenin and oleanolic acid oligoglycosides. It is noted that they all have the common unit, 3-O-α-L-ara·pyranoside, and that XV', XIX'and XX, having the same trisaccharide combined with the 28-carboxyl group of the aglycone, are corresponding to I, III and IX, respectively.
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