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Abstract:
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The phenolic composition of skins and seeds from Vitis vinifera L. cv. Carme´n ere and Cabernet
Sauvignon grapes during ripening was evaluated by high-performance liquid chromatography-diode
array detection and spectrophotometric analysis. As compared to Cabernet Sauvignon grape skins,
Carme´n ere grape skins presented higher contents of total anthocyanins, monomeric flavan-3-ols,
and total flavonoids, a higher mean degree of polymerization, a higher percentage of galloylation, a
higher average molecular weight of the flavanol fraction, and a higher color intensity. As compared
to Cabernet Sauvignon grape seeds, Carme´n ere grape seeds presented a lower content of
monomeric flavan-3-ols, a higher mean degree of polymerization, a higher percentage of galloylation,
a higher average molecular weight of the flavanol fraction, a lower content of (þ)-catechin, and
higher contents of (-)-epicatechin, epicatechin-3-O-gallate, gallic acid, and dimeric procyanidins
esterified with gallic acid. Altogether, we conclude that Carme´n ere grapes present a differential
composition and evolution of phenolic compounds when compared to Cabernet Sauvignon grapes. |