1. Research Institute of Agricultural Quality Standards and Testing Technology, Hubei Academy of Agricultural Science, Wuhan 430064, Hubei, P. R. China
2. Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
3. Hubei Key Laboratory of Nutritional Quality and Safety of Agro products, Wuhan 430064, Hubei, P. R. China
4. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, Sichuan, P. R. China