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Abstract
With the aid of a selective enzyme system, genins G, K, N, and gymnestrogenin were isolated and shown to be the aglycones of gymnemic acids A-D, respectively. Genin G was found to be an acylated derivative of gymnemagenin containing formic, acetic, isovaleric, and tiglic acids, while genin K differed from G by the absence of the acetic acid residue. Genin N was observed to be gymnestrogenin tiglate. Genin J, probably an artifact originating from genin G, was also isolated and indicated to be gymnemagenin esterified with acetic, isovaleric, and tiglic acids. The sugar moieties of acids A and B are not acylated, while those of acids C and D are indicated to be esterified with ferulic acid.
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