Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 10, Pages 5932-5937Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.03.008
Keywords
Kenaf; Laccase; Natural mediators; Delignification; Functionalization
Funding
- Spain's MICINN [CTQ2009-12904]
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This paper reports the first application of laccase-mediator systems (LMS) to kenaf pulp. Five natural phenolic compounds (acetosyringone, syringaldehyde, p-coumaric acid, vanillin and acetovanillone) were used as mediators in combination with laccase in an L stage in order to elucidate their effect on delignification. After LMS treatment, pulp samples were subjected to two alkaline treatments (an E or P stage). The results obtained were compared with those provided by the laccase-1-hydroxybenzotriazole (HBT) system. All natural mediators increased kappa number, decreased brightness and changed optical properties of the pulp after the L stage, suggesting that natural mediators tend to couple to fibers during a laccase-mediator treatment. The greatest delignification and bleaching effects after the P stage were obtained with syringaldehyde and acetosyringone, providing an effective means for delignifying kenaf, whereas those based on the other three could be used to functionalize kenaf with a view to obtaining pulp with novel properties. (C) 2011 Elsevier Ltd. All rights reserved.
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