1. Canadian Grain Commission, 1404-303 Main St., Winnipeg, MB, R3C 3G8, Canada. GRL contribution no. 847.
2. Corresponding author. Phone: 204-983-8033. Fax: 204-983-0724. E-mail: nedwards@grainscanada.gc.ca.
3. Dept. Food Sci. Cornell University, Stocking Hall, Ithaca, NY.
4. Dept. Food Sci., University of Manitoba, Winnipeg, MB, R3T 2N2, Canada.