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A novel deep eutectic solvent from lignin-derived acids for improving the enzymatic digestibility of herbal residues from cellulose

Chen, Long, Yu, Qiang, Wang, Qiong, Wang, Wen, Qi, Wei, Zhuang, Xinshu, Wang, Zhongming, Yuan, Zhenhong
Cellulose 2019 v.26 no.3 pp. 1947-1959
biomass, cellulose, choline, cortex, digestibility, enzymatic hydrolysis, lignin, p-coumaric acid, recycling, refining, solvents
A novel lignin-derived deep eutectic solvent (DES) was synthesized from choline chloride (ChCl) and p-coumaric acid (PCA). The results showed that after pretreatment with lignin-derived DES, the dense cellulose–hemicellulose–lignin structure of herb residues of Cortex albiziae (HRCA) was effectively broken down and this facilitated subsequent enzymatic hydrolysis. The optimum pretreatment conditions were ChCl/PCA molar ratio of 1:1, 160 °C-5 h, and a solid–liquid ratio of 1:10. Compared with untreated HRCA, 72-h enzymatic digestibility increased from 48.08 to 84.62%. When a ChCl–PCA–water pretreatment was used, the 72-h digestibility level of the residue reached 99.36%. Moreover, the recycling and reusability of this novel DES were evaluated. The results showed that synthesis and utilization of green, environment-friendly and recyclable lignin-derived DES can offer a new way of utilizing lignin which has considerable potential in the refining of biomass. A novel lignin-derived deep eutectic solvent was synthesized, this DES pretreatment can improve the enzymatic digestibility of HCRA cellulose efficiently.