Constituents of Geranium thunbergii Sieb. et Zucc. XIII Isolation of water-soluble tannins by centrifugal partition chromatography, and biomimetic synthesis of elaeocarpusin.

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  • Isolation of water-soluble tannins by centrifugal partition chromatography, and biomimetic synthesis of elaeocarpusin

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A highly water-soluble polyphenolic compound, geraniinic acid A, together with elaeocarpusin which is composed of equimolar geraniin and ascorbic acid, has been isolated from Geranium thubergii SIEB. et ZUCC. by means of centrifugal partition chromatography and gel chromatography, and the structure was elucidated on the basis of degradative and spectroscopic studies. One of these compounds, elaeocarpusin, was synthesized by condensation of geraniin and ascorbic acid; this route is considered to be biomimetic. The distribution of elaeocarpusin in various plants including Acer nikoense MAXIM. was also investigated.

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