1. Postdoctoral research associate and professors, respectively, Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506.
2. Presently, research chemist, USDA-ARS Grain Marketing and Production Research Center, Manhattan, KS 66502.
3. Research chemist and supervisory research chemist, respectively, USDA-ARS Grain Marketing and Production Research Center, Manhattan, KS 66502.
4. Corresponding author. Phone: 785-776-2703; Fax: 785-776-2792; E-mail: okchung@gmprc.ksu.edu