%0 Journal Article %T 球磨麦草茎秆和叶子的LiCl/DMSO溶解和水再生行为比较(英文) %A 姜波 %A 谷峰 %A 吴文娟 %A 王志国 %A 金永灿 %J 林业工程学报 %D 2018 %R 10.13360/j.issn.2096-1359.2018.04.015 %X 木质纤维素生物质细胞壁全组分在有机溶剂或离子液体中的溶解是解析木质纤维素结构特性和制备生物质基材料的有效途径。笔者将不同球磨程度的麦草茎秆和叶子溶解在8%(w/w)LiCl/DMSO溶剂体系,并于水中再生,对比分析麦草茎秆和叶子溶解-再生行为及木质素结构特性对再生原料酶水解性能的影响。结果显示,球磨4 h的麦草茎秆和叶子可完全溶解在LiCl/DMSO溶剂体系,但麦草茎秆木质素及碳水化合物的溶解-再生行为与叶子有较大差异。经LiCl/DMSO溶解和水再生的原料,部分木质素损失,酶水解效率显著提高,且再生叶子酶水解效率明显高于再生茎秆。化学降解分析表明,短时间的球磨处理(≤4 h)和溶解再生过程对木质素结构影响较小,但球磨时间延长对木质素β-O-4键特别是赤型结构破坏严重。麦草茎秆木质素比叶子木质素具有较高的硝基苯氧化、臭氧降解得率、赤型/苏型结构比例以及较多的β-O-4连接键。麦草茎秆和叶子酶水解效率及木质素结构的差异表明,木质纤维素生物质酶水解效率不仅受木质素芳环结构的影响,而且受木质素侧链β-O-4连接键的影响。</br>The complete dissolution of cell wall components of lignocellulosic biomass in organic solvent or ionic liquid is an effective pathway to analyze and understand their structural characteristics for the developing of new bio-based materials. In this study, ball-milled wheat(Triticum aestiuium)stem and leaf were dissolved in 8% lithium chloride/dimethylsulfoxide(LiCl/DMSO)solvent system, and then regenerated in water. The behaviors of wheat stem and leaf in the dissolution/regeneration process and the effect of lignin structure on enzymatic hydrolysis were comparatively investigated. The results showed that 4 h ball-milled samples could completely dissolve in the solvent system. However, the dissolution/regeneration behavior of carbohydrates and lignin in wheat stem was rather different from that in leaf. After dissolution/regeneration, part of lignin was removed and the enzymatic digestibility was effectively improved. In addition, regenerated leaf exhibited higher enzymatic digestibility than corresponding stem did. Results of wet chemistry analysis indicated that the effects of ball milling within 4 h and dissolution/regeneration process were not significant on lignin structure except that the β-O-4 linkages especially erythro form were seriously disrupted after 4 h ball milling. Stem lignin that contained more β-O-4 linkages and had higher erythro/threo ratio has higher yields of nitrobenzene oxidation and ozonation products. The substrate enzymatic digestibility is influenced not only by aromatic structure but also by side-chain β-O-4 linkages of lignin %K 麦草 %K LiCl/DMSO溶解 %K 再生 %K 酶水解效率 %K 木质素结构< %K /br> %K wheat straw %K LiCl/DMSO dissolution %K regeneration %K enzymatic hydrolysis %K lignin structure %U http://lkkf.njfu.edu.cn//oa/darticle.aspx?type=view&id=201804015