1. Permanent address: Department of Food Science and Technology, Anhui Agricultural University, Hefei, China.
2. Wheat Marketing Center, Inc., 1200 NW Naito Parkway, Suite 230, Portland, OR 97209.
3. Corresponding author. Phone: (503) 295-0823. Fax: (503) 295-2735. E-mail: ghou@wmcinc.org