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Effect of enzymatic treatment on Eucalyptus globulus vessels passivation

Scientific reports, 2023-02, Vol.13 (1), p.2832-2832, Article 2832 [Peer Reviewed Journal]

2023. The Author(s). ;The Author(s) 2023. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;The Author(s) 2023 ;ISSN: 2045-2322 ;EISSN: 2045-2322 ;DOI: 10.1038/s41598-023-29861-w ;PMID: 36801894

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  • Title:
    Effect of enzymatic treatment on Eucalyptus globulus vessels passivation
  • Author: Vaz, Álvaro ; Coelho, João ; Costa, Vera ; Maloney, Thaddeus ; Phiri, Josphat ; Pinto, Paula ; de Sousa, António Mendes ; Simões, Rogério
  • Subjects: Carbohydrates ; Cellulases ; Chlorine ; Contact angle ; Eucalyptus - chemistry ; Eucalyptus globulus ; Hardwoods ; Hemicellulose ; Hydrophobicity ; Industry ; Porosity
  • Is Part Of: Scientific reports, 2023-02, Vol.13 (1), p.2832-2832, Article 2832
  • Description: Hardwood vessel elements generate problems in industrial uncoated wood-free printing paper operation, causing vessel picking and ink refusal. These problems are mitigated using mechanical refining at the cost of paper quality. Vessel enzymatic passivation, altering its adhesion to the fiber network and reducing its hydrophobicity is a way of improving paper quality. The object of this paper is to study how the enzymatic treatment by xylanase and by an enzymatic cocktail containing cellulases and laccases affect elemental chlorine free bleached Eucalyptus globulus vessel and fiber porosities, bulk, and surface chemical compositions. Thermoporosimetry revealed the vessel structure to be more porous, surface analysis showed its lower O/C ratio and bulk chemistry analysis its higher hemicellulose content. Enzymes had different effects on porosity, bulk and surface composition of fibers and vessels, affecting vessel adhesion and hydrophobicity. Vessel picking count decreased 76% for papers containing vessels treated with xylanase and 94% for the papers with vessels treated with the enzymatic cocktail. Fiber sheet samples had lower water contact angle (54.1º) than vessels rich sheets (63.7º), that reduced with xylanase (62.1º) and cocktail (58.4º). It is proposed that differences in vessel and fiber porosity structures affect the enzymatic attacks, eventually causing vessel passivation.
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 2045-2322
    EISSN: 2045-2322
    DOI: 10.1038/s41598-023-29861-w
    PMID: 36801894
  • Source: MEDLINE
    PubMed Central
    ProQuest Central
    DOAJ Directory of Open Access Journals
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