Abstract
Samples of a two-year-old Port red wine were fractionated by Toyopearl gel column chromatography yielding different coloured fractions. Anthocyanin-derived compounds were tentatively identified by LC/DAD-MS in the different eluted fractions. Several pigments were found to correspond to a recently reported family of pyranoanthocyanin compounds named portisins, supposedly arising from the reaction between anthocyanin-pyruvic acid adducts and flavanols in the presence of acetaldehyde. These pigments present a structure in which pyranoanthocyanins are linked to flavanols (catechins or procyanidin dimers) through a vinyl linkage. These pigments showed a UV-visible spectrum with a λmax batochromically shifted from that of genuine anthocyanins, thereby contributing to a more bluish hue.
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