1. Laboratory of Polymer Physics and Chemistry; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
2. Enzyme Research Team; Biomass Engineering Program Cooperation Division; Center for Sustainable Resource Science; RIKEN, 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan
3. School of Polymer Science and Engineering; Qingdao University of Science and Technology; Qingdao 266042 China