1. Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506.
2. Present address: Laboratory of Food Chemistry and Biochemistry, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, B-3001, Leuven, Belgium.
3. Division of Biology, Kansas State University, Manhattan, KS 66506.
4. Corresponding author. Phone: +1.785.532.5320. Fax: +1.785.532.7010. E-mail: jfaubion@ksu.edu