在纤维素分解过程中剖析力相互作用,揭示了克服生物质复原的必要溶剂多功能性
Hyung Min Cho1, Adam S Gross, Jhih-Wei Chu
1Department of Chemical and Biomolecular Engineering, Energy Biosciences Institute, University of California, Berkeley, California, United States.
Journal of the American Chemical Society
|July 30, 2011
概括
像BmimCl这样的离子液体 (IL) 有效地溶解纤维素,这是生物燃料生产的关键步骤. 分子模拟显示ILs与纤维素的相互作用比水更有效,指导更好的预处理溶剂的设计.
科学领域:
- 生物质转化和生物燃料
- 材料科学与工程 材料科学与工程
- 计算化学计算化学
背景情况:
- 纤维素分解对于将纤维素生物质转化为生物燃料至关重要.
- 纤维素在常见溶剂中的不溶性需要先进的预处理方法.
- 离子液体 (ILs) 在溶解纤维素方面表现有前途.
研究的目的:
- 用离子液体 (ILs) 阐明纤维素分解的分子机制.
- 为了比较水中的纤维素分解的自由能量概况与IL.
- 确定ILs的设计策略,以加强纤维素预处理.
主要方法:
- 从纤维素微纤维素中模拟解构一个11残留的葡萄糖链.
- 在水和1-丁-3-甲基利米达化物 (BmimCl) 中计算的自由能量概况.
- 采用粗粒度方案和力匹配来进行相互作用分析.
主要成果:
- 与水相比,BmimCl中的纤维素分解具有较低的自由能量成本 (每个葡萄糖残留量约2kcal/mol).
- 溶剂与葡萄糖的相互作用取决于状态,BmimCl显示出对葡萄糖残留的多功能向.
- BmimCl 离子与基团强烈相互作用;在剥离状态下,子与侧链和链接氧气有效地配对.
结论:
- 与水相比,离子液体,特别是BmimCl,提供了优越的纤维素分解.
- 设计IL离子以准特定的纤维素结构是预处理的一个有前途的策略.
- 了解依赖状态的溶剂-葡萄糖相互作用是优化预处理溶剂设计的关键.
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