Structural and chromatic characterization of a new malvidin 3-glucoside-vanillyl-catechin pigment

A new pigment, resulting from the reaction between malvidin 3-glucoside and catechin in the presence of vanillin, was detected in a model solution. This newly formed anthocyanin-aryl-flavanol adduct was structurally characterized by I D and 2D NMR and mass spectrometry, and its chromatic characteristics were studied by UY-Vis techniques. The new pigment was shown to have a wavelength of maximum absorption in the visible region (lambda(max)) of 549 nm, conferring on it a purple colour, and a molar extinction coefficient value (epsilon) of 12,2471 center dot mol(-1) center dot cm(-1). (c) 2006 Elsevier Ltd. All rights reserved.