1. MGP Ingredients, Inc., Atchison, KS, U.S.A.
2. Corresponding author. Department of Grain Science and Industry, Shellenberger Hall, Kansas State University, Manhattan, KS 66506.Tel: +1.785.532.4088; Fax: +1.785.532.7010.
3. Kansas State University, Manhattan, KS, U.S.A.