%0 Journal Article %A V. Schneider %T Evaluation of Small Amounts of Flavonoid Phenols in White Wines by Colorimetric Assays %D 1995 %R 10.5344/ajev.1995.46.2.274 %J American Journal of Enology and Viticulture %P 274-277 %V 46 %N 2 %X 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. %U https://www.ajevonline.org/content/ajev/46/2/274.full.pdf