1. REQUIMTE, LAQV, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
2. Joint Research Unit 1083, Sciences for Enology, Institut National de la Recherche Agronomique (INRA), 2 Place Pierre Viala, F-34060 Montpellier, France