Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 13, Pages 11150-11156Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b00204
Keywords
Lignin depolymerization; Laccase; Oxidation; Alkaline treatment; Chemoenzymatic approach
Categories
Funding
- Excellence Initiative of the German Research Foundation
- DFG training group 1166 BioNoCo (Biocatalysis in Non-conventional Media)
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Lignin depolymerization is a coveted process for the generation of high-value compounds from a low-cost feedstock. This report describes a chemoenzymatic approach for the depolymerization of lignin involving a laccase-catalyzed oxidation under ambient air at room temperature followed by a base (NaOH)-induced depolymerization in aqueous solution at 37 degrees C. Two-dimensional nuclear magnetic resonance heteronuclear single quantum coherence spectroscopy, gel permeation chromatography, and liquid chromatography-electrospray ionization-quadrupole-time of flight-mass spectrometry (LC-ESI-Q-TOF-MS) analysis indicated the degradation of lignin and the formation of water-soluble fractions containing guaiacol, syringol, vanillic acid, m-anisic acid, and veratric acid. Furthermore, guaiacol and veratric acid are the main final products in the chemoenzymatic decomposition of a beta-O-4 model compound.
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