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Insights on the stilbenes in Raboso Piave grape ( Vitis vinifera L.) as a consequence of postharvest vs on‐vine dehydration
Author(s) -
Brillante Luca,
De Rosso Mirko,
Dalla Vedova Antonio,
Maoz Itay,
Flamini Riccardo,
Tomasi Diego
Publication year - 2017
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.8679
Subject(s) - postharvest , dehydration , chemistry , vitis vinifera , resveratrol , wine , vine , food science , nutraceutical , horticulture , relative humidity , vineyard , botany , biology , biochemistry , physics , thermodynamics
BACKGROUND Grape withering is a process used to produce reinforced wines and raisins. Dehydration is usually carried out postharvest by keeping ripe grapes in special warehouses in controlled conditions of temperature, relative humidity (RH) and air flow. Alternatively, grape clusters can be left on the vines after the canes have been pruned. In general, dehydration increases stilbenes in grape, but there are few studies on the effects of on‐vine withering. The stilbene profiles of Raboso Piave grape during postharvest and on‐vine dehydration were studied here. RESULTS High‐resolution mass spectrometry (MS) was used to identify 19 stilbenes, including resveratrol monomers, dimers (viniferins), oligomers and glucoside derivatives. The two dehydration methods generally had different effects on the above nutraceuticals in grape. The samples kept in warehouses revealed significant increases in Z ‐ ω ‐viniferin, E ‐ ϵ ‐viniferin, δ ‐viniferin and another resveratrol dimer which were not observed in the plants. Trans ‐Resveratrol increased significantly only in samples dehydrated in the warehouse at 21 °C and 60–70% RH. CONCLUSION The findings increase knowledge of stilbene composition in grapes subjected to withering on‐vine. The choice of dehydration method affects the contents of these nutraceuticals in the grape and consequently in wines. Reasonably, it could also affect other secondary metabolites important for wine quality. © 2017 Society of Chemical Industry