1. Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, College of Pharmacy, Chengdu University, Chengdu 610052, P. R. China
2. Key Laboratory of Coarse Cereal Processing (Ministry of Agriculture and Rural Affairs), College of Food and Biological Engineering, Chengdu University, Chengdu 610106, P. R. China