1. Department of Food Science, University of Guelph, Guelph, ON N1G2W1, Canada.
2. Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55108-1038, U.S.A.
3. Corresponding author. Phone: (612) 624-1764. Fax: (612) 625-5272. E-mail: kseethar@umn.edu