Transformation of Lignin Model Compound and Lignin by Graphene Oxide Immobilized Laccase

Xue-Fei Zhou

Transformation of Lignin Model Compound and Lignin by Graphene Oxide Immobilized Laccase

Xue-Fei Zhou*
* Author for corresponding; e-mail address: lgdx602@sina.com
Volume: Vol.48 No.1 (January 2021)
Research Article
DOI:
Received: 19 July 2020, Revised: -, Accepted: 4 October 2020, Published: -

Citation: Zhou X., Transformation of lignin model compound and lignin by graphene oxide immobilized laccase, Chiang Mai Journal of Science, 2021; 48(1): 176-184.

Abstract

In the present study, laccase (Lac) was immobilized into molecular sieves (Lac/NaY, Lac/ SSZ, Lac/MCM) and graphene oxide (Lac/GO). The activities of these laccase preparations were comparatively studied on phenolic lignin model compound (vanillyl alcohol), nonphenolic lignin model compound (veratryl alcohol) and organosolv lignin, in the presence of ABTS. GO immobilized laccase (Lac/GO) afforded better performance in terms of conversion rate and reusability than the molecular sieves during oxidation of vanillyl alcohol and veratryl alcohol. GPC and ³¹P-NMR were used to characterize the structural modifications induced in the organosolv lignin. Compared to the molecular sieves, the GO-immobilized laccase was found to be more reactive, displaying higher distinct reaction selectivities in the oxidative pattern of the lignin.

Keywords: laccase, lignin model compound, immobilization, oxidation, lignin

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