Effect of enzymatic treatment on Eucalyptus globulus vessels passivation
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-02-17
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Language
en
Pages
12
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Scientific Reports, Volume 13, issue 1
Abstract
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.Description
This work made use of Aalto University Bioproducts and Biosystems Facilities. This work made use of Fiber Materials and Environmental Technologies Facilities at Universidade da Beira Interior. Funding Information: This work was carried out under the Project inpactus—innovative products and technologies from eucalyptus, Project No. 21874 funded by Portugal 2020 through European Regional Development Fund (ERDF) in the frame of COMPETE 2020 No. 246/AXIS II/2017. Publisher Copyright: © 2023, The Author(s).
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Vaz , Á , Coelho , J , Costa , V , Maloney , T , Phiri , J , Pinto , P , de Sousa , A M & Simões , R 2023 , ' Effect of enzymatic treatment on Eucalyptus globulus vessels passivation ' , Scientific Reports , vol. 13 , no. 1 , 2832 . https://doi.org/10.1038/s41598-023-29861-w
