1. Department of Applied Microbiology and Food Science, University of Saskatchewan, Saskatoon, SK, Canada.
2. Bioproducts and Bioprocesses National Science Program, Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, S7N 0X2, Canada.
3. Corresponding author. Phone: 306-956-7637. Fax: 306-956-7247. E-mail: Changp@agr.gc.ca