Changes in the phenolic composition, phenol extractability indices and mechanical properties occur in grape berries during the ripening process but the heterogeneity of the grapes harvested at different ripening stages affects the reliability of the results obtained. In this work, these changes were studied in Nebbiolo grapes harvested during five consecutive weeks and then separated according to three density classes. The changes observed in chemical and mechanical parameters through the ripening process are more related to berries density than harvest date. Therefore, the winemaker has to select the flotation density according to the objective quality properties of the wine to elaborate. On the other hand, the stiffer grapes were associated with a higher accumulation of proanthocyanidins. The harder grapes provided the higher concentration and extractability of flavanols reactive to vanillin whereas the thicker ones facilitated the extraction of proanthocyanidins.

Influence of grape density and harvest date on the changes in phenolic composition, phenol extractability indices and instrumental texture properties during ripening.

ROLLE, Luca Giorgio Carlo;RIO SEGADE, SUSANA;TORCHIO, FABRIZIO;GIACOSA, SIMONE;MARENGO, FABIO;GERBI, Vincenzo
2011

Abstract

Changes in the phenolic composition, phenol extractability indices and mechanical properties occur in grape berries during the ripening process but the heterogeneity of the grapes harvested at different ripening stages affects the reliability of the results obtained. In this work, these changes were studied in Nebbiolo grapes harvested during five consecutive weeks and then separated according to three density classes. The changes observed in chemical and mechanical parameters through the ripening process are more related to berries density than harvest date. Therefore, the winemaker has to select the flotation density according to the objective quality properties of the wine to elaborate. On the other hand, the stiffer grapes were associated with a higher accumulation of proanthocyanidins. The harder grapes provided the higher concentration and extractability of flavanols reactive to vanillin whereas the thicker ones facilitated the extraction of proanthocyanidins.
59
8796
8805
phenolic composition; phenol extractability; anthocyanins; skin hardness; skin thickness; texture analysis; red grapes.
L. ROLLE; S. RÍO SEGADE; F. TORCHIO; S. GIACOSA; E. CAGNASSO; F. MARENGO; V. GERBI
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/83679
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