TY - JOUR T1 - Evaluation of Small Amounts of Flavonoid Phenols in White Wines by Colorimetric Assays JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 274 LP - 277 DO - 10.5344/ajev.1995.46.2.274 VL - 46 IS - 2 AU - V. Schneider Y1 - 1995/01/01 UR - http://www.ajevonline.org/content/46/2/274.abstract N2 - For evaluation of flavonoid phenols in the low concentration range in white table wines, four colorimetric assays have been compared: (a) reaction with Folin-Ciocalteu reagent before and after precipitation of flavonoids in HCl-methanal (FC); (b) reaction with vanillin (VAN); (c) reaction with 4-(dimethylamino)-cinnamaldehyde (DAC); and (d) a rapid browning test at 60°C in oxidative medium (POM). There was a highly positive correlation between concentration units obtained by FC, VAN, and DAC, while POM is poorly correlated to concentration units. VAN and, to a lesser extent, FC lead to an overestimation of flavonoid content. DAC displays highest sensitivity and reproducibility. It appears most suitable for appreciation of oxidative aging potential in routine control. ER -