Effect of functional groups in acid constituent of deep eutectic solvent for extraction of reactive lignin

Tan, Yee Tong and Ngoh, Gek Cheng and Chua, Adeline Seak May (2019) Effect of functional groups in acid constituent of deep eutectic solvent for extraction of reactive lignin. Bioresource Technology, 281. pp. 359-366. ISSN 0960-8524, DOI https://doi.org/10.1016/j.biortech.2019.02.010.

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Official URL: https://doi.org/10.1016/j.biortech.2019.02.010


In this study, acidic deep eutectic solvents (DES) synthesized from various organic carboxylic acid hydrogen bond donors were applied to lignocellulosic oil palm empty fruit bunch (EFB) pretreatment. The influence of functional group types on acid and their molar ratios with hydrogen bond acceptor on lignin extraction were evaluated. The result showed presence of hydroxyl group and short alkyl chain enhanced biomass fractionation and lignin extraction. Choline chloride:lactic acid (CC-LA) with the ratio of 1:15 and choline chloride:formic acid (CC-FA) with 1:2 ratio extracted more than 60 wt% of lignin. CC-LA DES-extracted lignin (DEEL) exhibited comparable reactivity with technical and commercial lignin based on its phenolic hydroxyl content (3.33–3.72 mmol/glignin). Also, the DES-pretreated EFB comprised of enriched glucan content after biopolymer fractionation. Both DES-pretreated EFB and DEEL can be potential feedstock for subsequent conversion processes. This study presented DES as an effective and facile pretreatment method for reactive lignin extraction. © 2019

Item Type: Article
Funders: University of Malaya research grants BKS009-2016 and GPF021A-2018
Uncontrolled Keywords: Oil palm empty fruit bunch; Organic acid deep eutectic solvent; Biomass fractionation; Phenolic hydroxyl content; Biopolymer utilization
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 03 Jan 2020 00:56
Last Modified: 03 Jan 2020 00:56
URI: http://eprints.um.edu.my/id/eprint/23286

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