Lewis base enhanced neutral deep eutectic solvent pretreatment for enzymatic hydrolysis of corn straw and lignin characterization
2022
Xie, Junxian | Tei, Sei | Zhu, Shiyun | Xu, Jun
In order to improve the pretreatment behavior of neutral deep eutectic solvent (DES), a novel method was proposed by using three types of Lewis base (sodium carbonate, sodium sulfite and sodium acetate as catalysts to pretreat corn straw at 120 °C for 3 h. As compared to DES, DES with Na₂SO₃, DES with NaAC and DES with Na₂CO₃, all can remove most of hemicellulose and lignin in pretreated corn straw. Meanwhile, the 94.5% of glucose yield was obtained treated by DES with Na₂CO₃ and was approximately five-fold higher than that of the untreated substrate at an enzyme loading of 15 FPU/g material. The regenerated lignin displayed well-preserved structures, and possessed a high purity (more than 84%), narrow molecular weight distribution (PDI <2.4), excellent thermal stability. Overall, this work provided detailed analysis for efficient deconstruction of corn straw for future industrialized application.
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