1. Department of Food Science and Technology, University of California, Davis, CA 95616-8598.
2. Food Materials Science Division, Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, UK.
3. Corresponding author. Phone: 530/752-1467. Fax: 530/752-4759. E-mail: cwbamforth@ucdavis.edu