1. IPICyT, Camino a la Presa, San José No. 2055, Col. Lomas 4ta, C. P. 78216, San Luis Potosí, Mexico
2. Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, 1201 West Gregory Drive, 228 ERML, MC-051, Urbana, IL 61801