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Using both xylanase and laccase enzymes for pulp bleaching

Bioresource technology, 2009-03, Vol.100 (6), p.2032 [Peer Reviewed Journal]

Attribution-NonCommercial-NoDerivs 3.0 Spain info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/3.0/es/ ;ISSN: 0960-8524 ;EISSN: 1873-2976 ;DOI: 10.1016/j.biortech.2008.10.009 ;PMID: 19038541

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  • Title:
    Using both xylanase and laccase enzymes for pulp bleaching
  • Author: Valls, Cristina ; Roncero, M Blanca
  • Subjects: Blanqueig ; Blanqueig de pastes ; Bleaching materials ; Endo-1,4-beta Xylanases - metabolism ; Enginyeria paperera ; Eucalyptus ; Laccase - metabolism ; Models, Theoretical ; Pasta paperera ; Àrees temàtiques de la UPC
  • Is Part Of: Bioresource technology, 2009-03, Vol.100 (6), p.2032
  • Description: Two enzyme treatments involving xylanase (X) and laccase (L) were used jointly in an XLE sequence (where E denotes alkaline extraction) to bleach oxygen-delignified eucalyptus kraft pulp in the presence of 1-hydroxybenzotriazol (HBT) as mediator. The results of the XLE sequence were compared with those of an LE sequence. The application conditions for the laccase-mediator system were optimized by using a sequential statistical plan involving three variables (viz., the laccase and mediator doses, and the reaction time) with both sequences. The models used to predict the kappa number and brightness revealed that, once all accessible lignin was removed, the system altered other coloured compounds. The best conditions for the L stage involved a reduced mediator dose (0.5% odp). The xylanase pretreatment increased the accessibility of residual lignin and facilitated removal of hexenuronic acids. For a specific target brightness level of 70% ISO, the X pretreatment can save as much as 30% laccase and 80% mediator while shortening the reaction time by 45%.
  • Publisher: England
  • Language: English
  • Identifier: ISSN: 0960-8524
    EISSN: 1873-2976
    DOI: 10.1016/j.biortech.2008.10.009
    PMID: 19038541
  • Source: Recercat
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