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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.