Journal
BIORESOURCE TECHNOLOGY
Volume 110, Issue -, Pages 297-301Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.12.120
Keywords
OCC pulp; Laccase; HBT; Physical properties; Carboxyl group content
Funding
- China Scholarship Council under State Scholarship Fund
- National Natural Science Foundation of China [31170551]
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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 160 U/g o.d. pulp, a treatment time of 20 h at 25 degrees 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. (C) 2012 Elsevier Ltd. All rights reserved.
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