Isolation and structural characterization of new anthocyanin-derived yellow pigments in aged red wines.

摘要: Two newly formed yellow pigments that revealed unique spectral features were detected and isolated from an aged Port red wine by TSK Toyopearl HW-40(s) gel chromatography characterized UV−visible spectrophotometry, 1H NMR 13C NMR, mass spectrometry (LC-ESI/MS). The UV−vis spectra of these showed maximum absorption at 478 nm is significantly hypsochromically shifted those original grape anthocyanins other pyranoanthocyanins, exhibiting a more hue in acidic solution. structures correspond to methyl-linked pyranomalvidin 3-glucoside its respective coumaroyl glucoside derivative. They shown arise the reaction between acetoacetic acid genuine anthocyanins. Isolation identification using 1D 2D techniques are reported for first time this new family anthocyanin-derived occurring wines. Keywords: Red wine; aging; color; anthocyanins; acid; methyl pyra...