1. Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50011.
2. Current address: Nestlé Research Center, Department of Food Science and Technology, PO Box 44, Vers-chez-les-Blanc, CH-1026 Lausanne, Switzerland.
3. Corresponding author. Phone: 1-515-294-9892; Fax: 1-515-294-8181 E-mail: jjane@iastate.edu