1. Estación de Viticultura y Enología de Galicia-INGACAL, Ponte San Clodio, 32427 Leiro, Spain
2. Analytical Chemistry, Nutrition and Bromatology Department, Faculty of Chemistry, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
3. Tecnology Transfer & Consulting Centre. FEM - Istituto Agrario di San Michele all’Adige, 38010 S. Michele all’Adige (TN) - Italy