1. Cereal Chemistry & Quality Analysis Laboratory, Faculty of Chemistry & Chemical Engineering, Shanxi University, Taiyuan City 030006, People's Republic of China, Department of Food Science, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada, Shanxi Academy of Agricultural Science, Taiyuan City 030031, People's Republic of China, and Cereal Science Laboratory, Department of Botany, University of Hong Kong, Hong Kong