1. Dept. Food Science, University of Arkansas, 2650 N. Young Avenue, Fayetteville, AR 72704.
2. Corresponding author. Phone: 479-575-4779. Fax: 479-575-6936. E-mail: nhettiar@uark.edu
3. DSM Nutritional Products Ltd, Dept. NRD/CF-Nutrition Research and Development/Center Formulation, PO Box 3255, 4002 Basel, Switzerland.