Abstract

Lignin is an abundant natural feedstock that offers great potential as a renewable substitute for fossil-based resources. Its polyaromatic structure and unique properties have attracted significant research efforts. The advantages of an enzymatic over chemical or thermal approach to construct or deconstruct lignins are that it operates in mild conditions, requires less energy, and usually uses non-toxic chemicals. Laccase is a widely investigated oxidative enzyme that can catalyze the polymerization and depolymerization of lignin. Its dual nature causes a challenge in controlling the overall direction of lignin-laccase catalysis. In this Review, the factors that affect laccase-catalyzed lignin polymerization were summarized, evaluated, and compared to identify key features that favor lignin polymerization. In addition, a critical assessment of the conditions that enable production of novel lignin hybrids via laccase-catalyzed grafting was presented. To assess the industrial relevance of laccase-assisted lignin valorization, patented applications were surveyed and industrial challenges and opportunities were analyzed. Finally, our perspective in realizing the full potential of laccase in building lignin-based materials for advanced applications was deduced from analysis of the limitations governing laccase-assisted lignin polymerization and grafting.

Original languageEnglish
JournalChemSusChem
Volume14
Issue number21
Pages (from-to)4615-4635
Number of pages21
ISSN1864-5631
DOIs
Publication statusPublished - 4 Nov 2021
MoE publication typeA2 Review article in a scientific journal

Fields of Science

  • CHEMICAL-REACTIVITY
  • ENZYMATIC MODIFICATION
  • FUNGAL LACCASES
  • KRAFT LIGNIN
  • MILLED WOOD LIGNIN
  • MODEL-COMPOUND
  • MOLECULAR-WEIGHT
  • ORGANOSOLV LIGNIN
  • OXIDATIVE POLYMERIZATION
  • TECHNICAL LIGNINS
  • enzyme catalysis
  • grafting
  • laccase
  • lignin
  • polymerization
  • 116 Chemical sciences

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