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Pretreatment of pine lignocelluloses by recyclable deep eutectic solvent for elevated enzymatic saccharification and lignin nanoparticles extraction

This study investigated the process intensification strategies for the pretreatment of Radiata Pine with the green deep eutectic solvent (DES) system composed of benzyltrimethylammonium chloride/formic acid (BTMAC/FA). The results showed that DES pretreatment drastically improved the delignification...

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Published in:Carbohydrate polymers 2021-10, Vol.269, p.118321-118321, Article 118321
Main Authors: Xie, Junxian, Chen, Junjun, Cheng, Zheng, Zhu, Shiyun, Xu, Jun
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Language:English
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description This study investigated the process intensification strategies for the pretreatment of Radiata Pine with the green deep eutectic solvent (DES) system composed of benzyltrimethylammonium chloride/formic acid (BTMAC/FA). The results showed that DES pretreatment drastically improved the delignification and hemicelluloses-removal capacity. The conducted process acceptably remained most of the cellulose in pretreated biomass (88.3%–91.8%). Benefiting from the overcoming of recalcitrance, the enzymatic digestibility of pretreated residues reached 92.4%. The efficient conversion was mainly ascribed to the lignin and hemicelluloses co-extraction. Meanwhile, the lignin yield and enzymatic saccharification was still largely maintained after five reuses. Further structural characteristics of lignin nanoparticles revealed that the lignin possessed high purity (95.19–97.51%), medium molecular weight (9600 to 6495 g/mol), and low polydispersity (ca 2.0), which was attributed to cleavage of ether bonds in lignin as well as linkages between lignin and hemicelluloses. Overall, this study illustrated that DES pretreatment was promising to achieve an efficient fractionation of woody biomass into fermentable glucose and high-quality lignin. •Novel deep eutectic solvent (DES) was prepared.•92.4% of enzymatic digestibility was acquired after DES pretreatment.•The effect of DES recycling was systematic study.•The DES-extracted lignin was in the form of lignin nanoparticles (LNP).•A better mechanistic comprehend of DES extraction of lignin was proposed.
doi_str_mv 10.1016/j.carbpol.2021.118321
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subjects Deep eutectic solvent
Enzymatic digestibility
Lignin and hemicelluloses co-extraction
Lignin nanoparticles
Radiata Pine
title Pretreatment of pine lignocelluloses by recyclable deep eutectic solvent for elevated enzymatic saccharification and lignin nanoparticles extraction
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