Use of a Modified Dimethylaminocinnamaldehyde Reagent for Analysis of Flavanols

• C.W. Nagel ^[1] ; Y. Glories ^[2]
  1. [1] Washington State University

     Washington State University

     Estados Unidos

     
  2. [2] University of Bordeaux

     University of Bordeaux

     Arrondissement de Bordeaux, Francia

     
• Localización: American Journal of Enology and Viticulture, ISSN 0002-9254, Vol. 42, Nº 4, 1991, págs. 364-366
• Idioma: inglés
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• Resumen

  • The acid concentration in the dimethylaminocinnamaldehyde (DC) reagent was reduced in order to give slower color development which allowed for more accurate assay of flavanols. The effect of water content in the sample on rate and total color development was shown. The method was used for estimation of degree of polymerization (DP) of isolated flavanols and flavanols in commercial wines of different ages. The apparent DP did not vary according to age of red wine except the youngest wine gave the lowest values. The ratio of flavonoids to DC values ranged from 3.24 to 3.89.