Developmental Changes of Procyanidins in Grapes of Red<i>Vitis vinifera</i>Varieties and Their Composition in Respective Wines
Víctor de Freitas, Yves Glories, A. Monique
American Journal of Enology and Viticulture
Abstract
Merlot and Cabernet Sauvignon grapes were sampled during the growing season until harvest. The content of catechins ((+)-catechin, (-)-epicatechin and (-)-epicatechin gallate, procyanidin dimers B1 to B8, and trimer C1) in the seeds and skin were determined. Procyanidin concentrations were found to be higher at veraison, then decreased, and remained relatively constant near harvest time. In general, Cabernet Sauvignon were richer in low molecular weight procyanidins than Merlot. Knowing that the dimer B4 is found only in grape seeds, and that dimer B2 is derived from both skin and seeds, it was possible to estimate the contribution of skin and seeds polyphenols to the total tannins in wines. At the end of vinification, the contribution of polyphenols extracted from grape seeds was found to be greater in Cabernet Sauvignon than in Merlot wines.
Extracted Claims
5 claims extracted from this paper into the knowledge graph
Cabernet Sauvignon be richer in low molecular weight procyanidins than Merlot
“In general, Cabernet Sauvignon were richer in low molecular weight procyanidins than Merlot.”
dimer B2 be derived from both skin and seeds
“Knowing that the dimer B4 is found only in grape seeds, and that dimer B2 is derived from both skin and seeds, it was possible to estimate the contribution of skin and seeds polyphenols to the total t...”
procyanidin concentrations be higher at veraison, then decreased, and remained relatively constant near harvest time
“Procyanidin concentrations were found to be higher at veraison, then decreased, and remained relatively constant near harvest time.”