1. Food Research Department, Universidad Autónoma de Coahuila, Saltillo Campus, P.O. Box 252, 25000 Coahuila, México; Department of Biotechnology, Universidad Autónoma Metropolitana, Iztapalapa Campus, Mexico DF 09340, México
2. Department of Biotechnology, Universidad Autónoma Metropolitana, Iztapalapa Campus, Mexico DF 09340, México