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使用超强碱离子液体评估新型硬木生物质的潜力。

Evaluating the potential of a novel hardwood biomass using a superbase ionic liquid.

作者信息

Muazzam Rabia, Asim Azmat Mehmood, Uroos Maliha, Muhammad Nawshad, Hallett Jason P

机构信息

Centre for Research in Ionic Liquids, School of Chemistry, University of the Punjab 54590 Lahore Pakistan

Institute of Basic Medical Sciences, Khyber Medical University KPK Pakistan

出版信息

RSC Adv. 2021 May 26;11(31):19095-19105. doi: 10.1039/d1ra01328a. eCollection 2021 May 24.

DOI:10.1039/d1ra01328a
PMID:35478656
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9033503/
Abstract

Lignocellulosic biomass, being ubiquitous and easily accessible, bears a huge potential for sustainable energy and other products. Fractionation, delignification, and subsequent utilization of hardwood biomass has been ever challenging for a bio-based refinery. (kikar in local language) is a hardwood tree commonly found in Pakistan, where its abundance owes to favorable and benign environmental conditions. Ionic liquids based on superbase "tetramethylguanidine (TMG)" are green solvents that are found to be good cellulose processing agents. Previously, TMG-based protic ionic liquids (PILs) have been used for cellulose processing and transformation into value-added products. In this study, an ionic liquid comprising a tetramethylguanidinium cation and a hydrogen sulfate anion was employed for the evaluation of the potential of acacia for fermentable sugars and lignin. Pretreatment was carried out at 100, 120, and 140 °C for 0.5, 1, 2 and 4 hours. The results indicate that [TMG][HSO] is an efficient delignifying agent affording 81% lignin removal and 76% sugar yield by subsequent enzymatic hydrolysis. The evaluation of the efficiency of IL and the biomass was verified by compositional analysis, FT-IR, HSQC, and SEM analyses.

摘要

木质纤维素生物质分布广泛且易于获取，在可持续能源和其他产品方面具有巨大潜力。对于基于生物的精炼厂而言，硬木生物质的分级、脱木质素及后续利用一直具有挑战性。（当地语言中的“kikar”）是一种在巴基斯坦常见的硬木树，其数量丰富归因于有利且温和的环境条件。基于超强碱“四甲基胍（TMG）”的离子液体是绿色溶剂，被发现是良好的纤维素加工剂。此前，基于TMG的质子离子液体（PILs）已用于纤维素加工并转化为增值产品。在本研究中，一种包含四甲基胍阳离子和硫酸氢根阴离子的离子液体被用于评估相思树制取可发酵糖和木质素的潜力。预处理在100、120和140℃下进行0.5、1、2和4小时。结果表明，[TMG][HSO]是一种高效的脱木质素剂，通过后续酶水解可去除81%的木质素并获得76%的糖产率。通过成分分析、傅里叶变换红外光谱（FT-IR）、异核单量子相干谱（HSQC）和扫描电子显微镜（SEM）分析验证了离子液体和生物质的效率评估。

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