1. Graduate research assistant and associate professor, respectively, Department of Cereal Science, North Dakota State University, Fargo, ND 58105.
2. Present address: Kerry Ingredients, Beloit, WI.
3. Present address: Food and Agricultural Products Research and Technology Center, Oklahoma State University, Stillwater 74078.
4. Corresponding author. E-mail: rayasdu@okway.okstate.edu Fax: 405/744-6313.
5. Research chemist, USDA-ARS, Hard Red Spring and Durum Wheat Quality Laboratory, Fargo, ND 58105.