RT Journal Article SR Electronic T1 Effect of Pomace-Contacting Method on the Concentration of cis- and trans-Resveratrol and Resveratrol Glucoside Isomers in Wine JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 401 OP 406 DO 10.5344/ajev.2004.55.4.401 VO 55 IS 4 A1 Steven S. Clare A1 Geoffrey Skurray A1 R. Andrew Shalliker YR 2004 UL http://www.ajevonline.org/content/55/4/401.abstract AB The effect of various pomace-contacting (maceration) methods on the concentrations of cis- and trans-resveratrol and resveratrol glucoside isomers were investigated in Vitis vinifera L. cv. Cabernet Sauvignon grape musts during alcoholic fermentation. Compared to a classical red wine vinification (control), carbonic maceration resulted in no detectable quantities of all four forms of resveratrol throughout fermentation and pressing. Prefermentation cold-soaking significantly increased (p < 0.01) both free isomers of resveratrol in free-run, press, and mix wine despite no significant differences with the control in trans-resveratrol glucoside concentration and slightly less extraction of cis-resveratrol glucoside. Free resveratrol was absent in the must heated prior to fermentation, while the level of resveratrol glucosides significantly increased (p < 0.001) relative to the control. In the final wines ready for bottling or aging, thermovinification proved most beneficial with respect to total resveratrol concentration, being 266% higher than that achieved in the control, while cold-soaking proved less beneficial, improving total resveratrol by 27%.