Abstract
Quantitative changes in oligomeric procyanidins [dimeric procyanidins (B1, B2, B3, B4), galloylated dimeric (B1-3-0-gallate, B2-3-0-gallate, and B2-3’-0-gallate), trimeric procyanidins (C1, T2)] and monomers [(+)-catechin and (-)-epicatechin] in seeds, stems, and skins of maturing Castelão Francês and Touriga Francesa (Vitis vinifera L.) grapes were measured using reversed-phase high-perfomance liquid chromatography (HPLC). For skins, only dimeric procyanidins (B1, B3, and B4) were detected during maturation. The level of oligomeric procyanidins from seeds, stems, and skins in both grape cultivars studied decreased during ripening, mainly in the first stages of maturation. (+)-Catechin and (-)-epicatechin from seeds in both grape varieties increased during the first stages of ripening, followed by a strong decrease and stabilization. Procyanidins B4 and B2 were the most abundant individual oligomeric procyanidins from seeds in Castelão Francês and Touriga Francesa, respectively, during maturation, while in the case of stems and skins, B1 was the principal oligomeric procyanidin in both grapes cultivars studied.
Acknowledgments: The authors thank José Maria da Fonseca Succs S.A., Azeitão, Portugal, for grapes and for support.
- Copyright 2001 by the American Society for Enology and Viticulture
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Vol 52 Issue 3
