The Difference for Enzymatic Hydrolysis of Sugarcane Bagasse Pre-treated by Different Deep Eutectic Solvents
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Abstract:
In order to evaluate the influence of deep eutectic solvents (DESs) pretreatment on lignocellulosic biomass, five DESs with choline chloride (ChCl) as hydrogen bond acceptor (HBA) and five DESs with malic acid as hydrogen bond donor (HBD) were used to pretreat sugarcane bagasse. The effects of HBDs and HBAs on the components and enzymatic hydrolysis efficiency of biomass were studied. Among ChCl-based DESs, lactic acid-choline chloride (LC) showed the best enzymatic hydrolysis efficiency. The cellulose content in the residue was 72.92%. The glucose yield and cellulose digestibility after saccharification were 56.90% and 60.43%, respectively. Among malic acid-based DESs, malic acid-choline chloride was the best one with the highest xylan and lignin removal, resulting in 43.35% of cellulose digestibility and 38.00% of glucose yield. The results showed that both HBD and HBA played a non-ignorable role in biomass deconstruction, and the strength of intermolecular hydrogen bond in DESs was negatively correlated with their deconstruction ability. Besides, it was found that the xylan removal could be correlated to the pKa value of HBDs or HBAs, while the cellulose digestibility was positively related to xylan removal, instead of delignification. In addition, the intermolecular hydrogen bond strength of DESs and the hydrogen bonding interaction between DES and biomass have been proved to be related to the pretreatment temperature and time in a certain range. Results of this work will provide a theoretical basis for developing novel DESs for biomass pretreatment.
