Depolymerization of Laccase-Oxidized Lignin in Aqueous Alkaline Solution at 37 
°C

Liu, Haifeng; Zhu, Leilei; Wallraf, Anne-Maria; Räuber, Christoph; Grande, Philipp M.; Anders, Nico; Gertler, Christoph; Werner, Bernd; Klankermayer, Jürgen; Leitner, Walter; Schwaneberg, Ulrich

doi:10.1021/acssuschemeng.9b00204

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Depolymerization of Laccase-Oxidized Lignin in Aqueous Alkaline Solution at 37 °C

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Leitner, Walter
Research Department Leitner, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Citation

Liu, H., Zhu, L., Wallraf, A.-M., Räuber, C., Grande, P. M., Anders, N., et al. (2019). Depolymerization of Laccase-Oxidized Lignin in Aqueous Alkaline Solution at 37 °C. ACS Sustainable Chemistry & Engineering, 7(13), 11150-11156. doi:10.1021/acssuschemeng.9b00204.

Cite as: https://hdl.handle.net/21.11116/0000-0006-5AA1-F

Abstract

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.