1. Cereal Group, Institute of Agrochemistry and Food Technology (IATA-CSIC), P.O. Box 73, 46100 Burjassot, Valencia, Spain.
2. Corresponding author. Phone: +34 963900022. Fax: +34 963636301. E-mail: crosell@iata.csic.es
3. Universidad Nacional Agraria La Molina, Facultad de Industrias Alimentarias, Av. La Molina s/n, Lima, Peru.