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Modification of the physical properties of old corrugated container (OCC) pulp with laccase or a laccase-mediator (ABTS, HBT, VA) system was investigated under select enzymatic concentrations and reaction times. The optimal conditions for laccase treatment shown to be using a laccase dose of 160U/g o.d. pulp, a treatment time of 20h at 25°C, pH 7 with a pulp consistency of 5%. Results showed that the Lac-HBT treated OCC pulp gave the best strength properties, improving tensile strength by 15.7%. The increase in the carboxyl group content of OCC laccase or Lac-HBT treated pulp led to the increase in the swelling ability and bonding between fibers. Microscope images showed the fiber surface became rougher and more collapsible after Lac-HBT treatment. FT-IR data showed that new carboxylic acid groups were formed during Lac-HBT treatment. Copyright © 2012 Elsevier Ltd. All rights reserved.


Yangmei Chen, Jinquan Wan, Yongwen Ma, Bing Tang, Wenjia Han, Arthur J Ragauskas. Modification of old corrugated container pulp with laccase and laccase-mediator system. Bioresource technology. 2012 Apr;110:297-301

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PMID: 22326330

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