纤维素
纤维素酶
多糖
溶解循环
化学
制作
单加氧酶
酶
化学工程
生物化学
高分子科学
生物
工程类
医学
病毒
替代医学
病理
病毒学
细胞色素P450
作者
Jie Wu,Yufeng Yuan,Qi Hua,Tao Zou,Zhangmin Wan,Gio Ferson M. Bautista,Orlando J. Rojas,Scott Renneckar,Jack Saddler
标识
DOI:10.1016/j.carbpol.2024.123037
摘要
Cellulose is the world's most abundant natural polymer and it can be used as a substitute for fossil derived products. The work described here evaluated the use of mono-component enzyme treatment, using endoglucanase (EG) and lytic polysaccharide monooxygenase (LPMO), to improve the properties of micro-fibrillated cellulose (MFC) produced from mechanically refined kraft pulp. Endoglucanase treatment of the pulp significantly reduced the degree of polymerization (DP) of the cellulose by promoting fiber cutting. In contrast, LPMO treatment only slightly reduced the fiber length and pulp viscosity. However, the introduction of carboxylic acid groups by the action of LPMO appeared to enhance the accessible surface area of cellulose. Enzyme-treated MFC showed improved nano-fibrillation with transmittance and water retention values increased after both enzyme treatments. The cellulose films derived from enzyme-treated MFC showed enhanced mechanical properties with the LPMO-treated films showing superior tensile strength (77 MPa) and Young's modulus (3600 MPa). Thermogravimetric analysis (TGA) also indicated improved thermal stability for both enzyme-treated films. LPMO treatments proved more effective, promoting nano-fibrillation while maintaining fiber integrity and enhanced intermolecular interactions.
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