Enzyme, including laccase and peroxidase, catalyzed oxidative polymerization of technical bagasse soda lignin and low molecular
weight ultra-filtrated kraft pulp lignin in methanol-water solution were studied. The weight average molecular weight of original
macromonomer and polymerized lignin were characterized with alkaline size exclusion chromatograph system. Laccase treatment increased
the molecular weight of both technical bagasse lignin and ultra-filtrated lignin up to 20 times in 24h. Compared to the low molecular
weight ultra filtrated lignin, the reaction rate of bagasse lignin was consistant during the whole procedure. The reaction time and
the laccase dosage were investigated to obtain the maximal molecular weight. The horseradish peroxidase treatment was a potential
method for low molecular weight ultra filtrated lignin.
Keywords: Laccase, Peroxidase, Enzymatic polymerization, Technical soda lignin, Ultra-filtrated kraft lignin.
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