1. School of Chemistry & Chemical Engineering, Henan University of Science and Technology, 263 Kaiyuan Avenue, Luoyang 471023, China
2. College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471023, China
3. Graduate school of Biotechnology, Korea University, 1,5-Ka Anam-Dong, Sungbuk-ku, Seoul 136-701, Korea