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2013 | 60 | 4 | 817-822
Article title

Oxidative polymerization of lignins by laccase in water-acetone mixture

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The enzymatic oxidative polymerization of five technical lignins with different molecular properties, i.e. Soda Grass/Wheat straw Lignin, Organosolv Hardwood Lignin, Soda Wheat straw Lignin, Alkali pretreated Wheat straw Lignin, and Kraft Softwood was studied. All lignins were previously fractionated by acetone/water 50:50 (v/v) and the laccase-catalyzed polymerization of the low molecular weight fractions (Mw < 4000 g/mol) was carried out in the same solvent system. Reactivity of lignin substrates in laccase-catalyzed reactions was determined by monitoring the oxygen consumption. The oxidation reactions in 50% acetone in water mixture proceed with high rate for all tested lignins. Polymerization products were analyzed by size exclusion chromatography, FT-IR, and 31P-NMR and evidence of important lignin modifications after incubation with laccase. Lignin polymers with higher molecular weight (Mw up to 17500 g/mol) were obtained. The obtained polymers have potential for applications in bioplastics, adhesives and as polymeric dispersants.
Physical description
  • "Politehnica" University of Timişoara, Faculty of Industrial Chemistry and Environmental Engineering, Timişoara, Romania
  • "Politehnica" University of Timişoara, Faculty of Industrial Chemistry and Environmental Engineering, Timişoara, Romania
  • Wageningen UR Food & Biobased Research, Wageningen, Netherlands
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