1. Instituto de Agroquímica y Tecnología de Alimentos (CSIC). P.O. Box 73, 46100-Burjassot, Valencia, Spain.
2. Corresponding author. Phone: 34-96-390 0022. Fax: 34-96-363 6301. E-mail:crosell@iata.csic.es.
3. Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506.
4. USDA-ARS, Grain Marketing and Production Research Center and Kansas State University, Manhattan, KS 66506.