1. Grain Research Laboratory, Canadian Grain Commission, 1404-303 Winnipeg MB Canada R3C 3G8. Contribution no. 291.
2. Corresponding author. Phone: 204-983-1300. E-mail: mizydorczyk@grainscanada.gc.ca.
3. Department of Food Science, University of Manitoba, Winnipeg, MB, Canada R3T 2N2.