1. Graduate student, postdoctoral research associate, and professor, respectively, 2312 Food Sciences Building, Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50011.
2. Currently, postdoctoral research associate, Whistler Center for Carbohydrate Research, Purdue University, West Lafayette, IN 47907-2009.
3. Currently, assistant professor, Department of Food Science, The Pennsylvania State University, University Park, PA 16802.
4. Corresponding author. Phone: 515-294-9688. Fax: 515-294-8181. E-mail: pjwhite@iastate.edu