RT Journal Article SR Electronic T1 Hydroxycinnamic Acid-Tartaric Acid Ester Content in Mature Grapes and During the Maturation of White Riesling Grapes JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 277 OP 281 DO 10.5344/ajev.1978.29.4.277 VO 29 IS 4 A1 Ong, B. Y. A1 Nagel, C. W. YR 1978 UL http://www.ajevonline.org/content/29/4/277.abstract AB 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.