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| Study on Mechanism of Improving Enzymatic Hydrolysis of Arundo donax L. Pretreated with Bio-based Ternary DES |
| Received:August 31, 2022 |
| DOI：10.11981/j.issn.1000-6842.2022.04.31 |
| Key Words:Arundo donax L.;ternary DES;pretreatment;enzymatic hydrolysis;compound kinetic model |
| Fund Project:国家自然科学基金（22008010）；高等学校学科创新引智计划项目（B21022）。 |
| Author Name | Affiliation | Postcode | | LI Haichao* | College of Material Science & Technology， Beijing Forestry University， Beijing， 100083 | 100083 | | LUO Yuxin | College of Material Science & Technology， Beijing Forestry University， Beijing， 100083 | 100083 | | MIAO Guohua | College of Material Science & Technology， Beijing Forestry University， Beijing， 100083 | 100083 | | LI Wenjing | College of Material Science & Technology， Beijing Forestry University， Beijing， 100083 | 100083 | | YOU Tingting | College of Material Science & Technology， Beijing Forestry University， Beijing， 100083 | 100083 | | XU Feng | College of Material Science & Technology， Beijing Forestry University， Beijing， 100083 | 100083 |
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| Abstract: |
| To address the problem of inefficiency of binary neutral deep eutectic solvent （DES）， a bio-based ternary DES （choline chloride/levulinic acid/1，4-butanediol） system was constructed and used to pretreat Arundo donax L. The chemical composition， structure， and surface morphology of Arundo donax L. before and after pretreatment were analyzed by component analysis， scanning electron microscopy （SEM）， X-ray diffraction （XRD）， and Fourier-transform infrared spectrometer （FT-IR）， and the mechanism of promoting enzymatic hydrolysis was explored using the compound kinetic model.The results showed that the ternary DES pretreatment was highly effective； the removal rates of lignin and hemicellulose were 46.4% and 75.6%， respectively， and the enzymatic hydrolysis efficiencies of residual cellulose and xylan were ~100% and 96.6%， respectively， after pretreatment at 140 ℃ for 3 h. Meanwhile， the as-constructed compound kinetic model accurately described the variation behavior of glucose and xylose during ternary DES pretreatment coupled with enzymatic hydrolysis （R2>0.99）. The high-efficient removal of hemicellulose and lignin， the increment of fiber surface roughness， and the destruction of cellulose crystal structure caused by increased pretreatment temperature were the main factors improving the enzymatic hydrolysis of Arundo donax L. |
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