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A high-pressure liquid chromatographic technique has been used to measure the amount of monocaffeoyl-, mono-p-coumaroyl-, and monoferuloyl-tartaric acids in grapes. The amount of each hydroxycinnamic acidtartaric acid ester has been quantitated on both a ppm and µg/berry basis during the maturation of White Riesling grapes. The concentration of each of the hydroxycinnamic acid-tartaric acid esters and two proposed triesters of caffeic or p-coumaric acid, tartaric acid and glucose is also given for 11 other black and white varieties of V. vinifera at or near maturation.
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Ong et al. (1978) studied this question.
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