1. Key Laboratory for Leather Chemistry and Engineering of the Education Ministry, Sichuan University, Chengdu, Sichuan, P. R. China;
2. Research Center of Biomedical Engineering, Sichuan University, Chengdu, Sichuan, P. R. China;
3. Fujian Key Laboratory of Green Design and Manufacture of Leather, Xingye Leather Technology Co., Ltd, Jinjiang, Fujian, P. R. China