Title

Alkali-catalyzed organosolv pretreatment of lignocellulose enhances enzymatic hydrolysis and results in highly antioxidative lignin.

Document Type

Article

Publication Date

2021

Journal

Energy & Fuels

Volume

35

Pages

5039-5048

Language

en.

Abstract

Herein, efficient exploitation of biomass with diluted alkali-aided methanol organosolv treatment has been proposed. The ultrahigh glucose yield and high value-added lignin from xylose residue were simultaneously achieved via the mild alkali catalytic organosolv treatment and enzymatic hydrolysis. The NaOH-aided methanol pretreatment resulted in a more efficient delignification of 86.7%, which significantly facilitated the cellulase accessibility toward gaining a high glucose yield of 97.7%. In addition, the recovered lignin is highly pure with small and homogeneous molecular weight and high thermal stability. The total phenolic and antioxidant activities of the lignin were carried out by a Folin–Ciocalteu method and radical DPPH and ABTS assays, respectively. Results revealed that the modified lignin effectively scavenged radicals compared to the commercial antioxidants (butylated hydroxytoluene). Overall, this study provides a mild but a highly promising pretreatment approach for energy production from biomass. The excellent radical scavenging capacity of the obtained lignin further sets the stage for biobased functional materials in the popular biorefinery.

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