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The decomposition of ginsenoside Rb2 (Rb2) in the rat large intestine after oral administration was investigated in detail. A part of Rb2 was decomposed and six decomposition products (I-VI) were observed on thin-layer chromatogram. Among them, five products (I-V) were isolated, and identification of these compounds was done by carbon-13 nuclear magnetic resonance (13C-NMR). On the basis of 13C-NMR analysis, these compounds were identified as ginsenoside Rd (I), 3-O-beta-D-glucopyranosyl-20-O- [alpha-L-arabinopyranosyl(1----6)-beta-D-glucopyranosyl]-20(S)- proto-panaxadiol (II), ginsenoside F2 (III), 20-O-[alpha-L-arabinopyranosyl(1----6)-beta-D-glucopyranosyl]-20(S )- protopanaxadiol (IV), and compound K (V), respectively.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Studies on absorption, distribution, excretion and metabolism of ginseng saponins. V. The decomposition products of ginsenoside Rb2 in the large intestine of rats.