1. Instituto de Ciencias Químicas, Faculdad de Agronomía y Agroindustrias, Universidad Nacional de Santiago del Estero, Av. Belgrano (S) 1912, 4200 Santiago del Estero, Argentina, and Department of Food Science, Faculty of Food Engineering, State University of Campinas, UNICAMP, P.O. Box 6121, Campinas, São Paulo 13083-862, Brazil