1. Laboratory of Antioxidants, Institute of Nutrition and Food Technology, University of Chile, Av. Macul 5540, Santiago 138-11, Chile, Laboratory of Microbiology, Institute of Nutrition and Food Technology, University of Chile, Av. Macul 5540, Santiago 138-11, Chile, and Laboratory of Synthesis and Natural Products, Department of Basic Sciences, Faculty of Sciences, University of Bío-Bío, Avenida Andrés Bello, s/n P.O. Box 447, Chillán, Chile