1. Dipartimento di Scienze degli Alimenti, Università di Bologna, P.zza Goidanich 60, I-47023 Cesena (FC), Italy, Engineering Chemistry Department, The Technical University of Catalonia, Avda Diagonal 647, E-08034 Barcelona, Spain, and Hugh Sinclair Unit of Human Nutrition, School of Chemistry, Food Biosciences and Pharmacy, The University of Reading, Whiteknights, P.O. Box 226, Reading RG6 6AP, U.K.