1. USDA-ARS Western Wheat Quality Laboratory, E-202 Food Science and Human Nutrition Facility East, P.O. Box 646394, Washington State University, Pullman, WA 99164-6394. Phone: 509-335-4062; Fax: 509-335-8573. Mention of trademark or proprietary product does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that also may be suitable.
2. Corresponding author. E-mail: abettge@wsu.edu