1. Key Laboratory of Industrial Biocatalysis Ministry of Education Department of Chemical Engineering Tsinghua University Beijing 100084 P. R. China
2. College of New Energy and Materials China University of Petroleum Beijing 102249 P. R. China
3. College of Food Science and Nutritional Engineering China Agricultural University Beijing 100083 P. R. China
4. School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 P. R. China