1. Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Nanning Normal University, Nanning 530001, PR China
2. Guangxi Tianyuan Biochemical Company Limited, Nanning 530001, PR China
3. Guangxi Colleges and University Key Laboratory of Beibu Gulf Oil and Natural Gas Resource Effective Utilization, Beibuwan University, Qinzhou 535000, China