Journal
CHIANG MAI JOURNAL OF SCIENCE
Volume 48, Issue 1, Pages 176-184Publisher
CHIANG MAI UNIV, FAC SCIENCE
Keywords
laccase; lignin model compound; immobilization; oxidation; lignin
Categories
Funding
- National Natural Science Foundation of China [21766015]
- Open Research Foundation of Key Laboratory of Hunan Forest Products and Chemical Industry Engineering of Jishou University [JDZ201803]
- Open Research Foundation of Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science of South-Central University for Nationalities [CHCL19005]
- Open Research Foundation of Key Laboratory of Pulp and Paper Science and Technology of Ministry of Education/Shandong Province of QiluUniversity of Technology [KF2015011]
- Open Research Foundation of Key Laboratory for Solid Waste Management and Environment Safety of Ministry of Education of China of Tsinghua University [SWMES 2017-09]
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In this study, laccase was immobilized into different carriers and comparative studies were conducted on phenolic and nonphenolic lignin model compounds in the presence of ABTS. The graphene oxide immobilized laccase showed better performance in terms of conversion rate and reusability. Characterization of structural modifications induced in organosolv lignin was carried out using GPC and P-31-NMR, revealing higher reactivity and selectivity of the graphene oxide-immobilized laccase compared to molecular sieves.
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 organosolvlignin, 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 P-31-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.
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