1College of Bioengineering, Sichuan University of Science and Engineering, Zigong 643000, P. R. China.
2College of Material and Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000, P. R. China.
3National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, P. R. China.
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