title: Changes in grape polyphenols (V. vinifera L.) as a consequence of post-harvest withering by high-resolution mass spectrometry: Raboso Piave versus Corvina.
abstract: Grape dehydration is an oenological process used for the production of high-quality reinforced and sweet wines. Corvina and Raboso Piave are two red grape varieties used for production of high-quality Italian wines, such as Recioto, Amarone di Valpolicella and Raboso Passito. Changes of polyphenolic composition of the grapes as a consequence of the withering were studied by ultra-high performance liquid chromatography-quadrupole time of flight mass spectrometry (UHPLC/QTOF); for identification of compounds a homemade HR-MS database of grape and wine metabolites, was used. Concomitant with trans-resveratrol and viniferins, relevant increases of other stilbenes (piceatannol, resveratrol trimers and tetramers) and antioxidant compounds (quercetin, syringetin and tamarixetin) were observed. These compounds are part of the induced metabolism occurring during the withering process and in general improve the nutraceutical properties of grapes and wines. On the other hand, longer processes showed to decrease flavan-3-ols and glycoside flavonols. Constant increase of E/Z ε-viniferin ratio was observed in all samples, and this parameter can be used to monitor the process. Copyright © 2016 John Wiley & Sons, Ltd.
authors.affiliation: Council for Agricultural Research and Economics (CREA) - Viticulture, Viale XXVIII Aprile, 26 - 31015, Conegliano (TV), Italy.
authors.forename: Mirko De
authors.initials: MD
authors.lastname: Rosso
authors.affiliation: Veneto Agricoltura, Viale dell'Università 14, 35020, Legnaro (PD), Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Soligo
authors.affiliation: Council for Agricultural Research and Economics (CREA) - Viticulture, Viale XXVIII Aprile, 26 - 31015, Conegliano (TV), Italy.
authors.forename: Annarita
authors.initials: A
authors.lastname: Panighel
authors.affiliation: Council for Agricultural Research and Economics (CREA) - Viticulture, Viale XXVIII Aprile, 26 - 31015, Conegliano (TV), Italy.
authors.forename: Roberto
authors.initials: R
authors.lastname: Carraro
authors.affiliation: Council for Agricultural Research and Economics (CREA) - Viticulture, Viale XXVIII Aprile, 26 - 31015, Conegliano (TV), Italy.
authors.forename: Antonio Dalla
authors.initials: AD
authors.lastname: Vedova
authors.affiliation: Department of Postharvest Science, Agricultural Research Organization, The Volcani Center, Rishon Lezion, 50250, Israel.|Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100, Israel.
authors.forename: Itay
authors.initials: I
authors.lastname: Maoz
authors.affiliation: Council for Agricultural Research and Economics (CREA) - Viticulture, Viale XXVIII Aprile, 26 - 31015, Conegliano (TV), Italy.
authors.forename: Diego
authors.initials: D
authors.lastname: Tomasi
authors.affiliation: Council for Agricultural Research and Economics (CREA) - Viticulture, Viale XXVIII Aprile, 26 - 31015, Conegliano (TV), Italy.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Flamini
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D016000:Cluster Analysis; D013058:Mass Spectrometry / Q000379:methods*; D055432:Metabolomics; D059808:Polyphenols / Q000032:analysis*; D027843:Vitis / Q000737:chemistry*
chemical_list: D059808:Polyphenols
keywords: grape; high-resolution mass spectrometry; polyphenols; post-harvest; withering