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Studying the effects of laccase treatment in a softwood dissolving pulp: cellulose reactivity and crystallinity

Attribution-NonCommercial-NoDerivs 3.0 Spain info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/3.0/es/ ;ISSN: 0144-8617 ;EISSN: 1879-1344 ;DOI: 10.1016/j.carbpol.2014.11.019

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Title:
Studying the effects of laccase treatment in a softwood dissolving pulp: cellulose reactivity and crystallinity
Author: Quintana, Elisabet ; Valls Vidal, Cristina ; Garcia Barneto, Agustín ; Vidal Lluciá, Teresa ; Ariza, J ; Roncero Vivero, María Blanca
Subjects: a-Cellulose ; Alkali solubility ; Blanqueig ; Blanqueig de pastes ; Bleaching ; Cellulose ; Cel·lulosa ; Cel·lulosa per a paper ; Dissolving pulp ; Enginyeria paperera ; Pasta de paper ; Pasta paperera ; Primeres matèries papereres ; Thermogravimetric analysis (TGA) ; Violuric acid ; Wood-pulp ; Àrees temàtiques de la UPC
Description: An enzymatic biobleaching sequence (LVAQPO) using a laccase from Trametes villosa in combination with violuric acid (VA) and then followed by a pressurized hydrogen peroxide treatment (PO) was developed and found to give high bleaching properties and meet dissolving pulp requirements: high brightness, low content of hemicellulose, satisfactory pulp reactivity, no significant cellulose degradation manifested by a-cellulose and HPLC, and brightness stability against moist heat ageing. The incorporation of a laccase–mediator system (LMS) to bleach sulphite pulps can be a good alternative to traditional bleaching processes since thermogravimetric analysis (TGA) showed that the laccase treatment prevented the adverse effect of hydrogen peroxide on fibre surface as observed during a conventional hydrogen peroxide bleaching treatment (PO). Although VA exhibited the best results in terms of bleaching properties, the performance of natural mediators, such as p-coumaric acid and syringaldehyde, was discussed in relation to changes in cellulose surface detected by TGA
Creation Date: 2015-03
Language: English
Identifier: ISSN: 0144-8617
EISSN: 1879-1344
DOI: 10.1016/j.carbpol.2014.11.019
Source: Recercat

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Studying the effects of laccase treatment in a softwood dissolving pulp: cellulose reactivity and crystallinity

Attribution-NonCommercial-NoDerivs 3.0 Spain info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/3.0/es/ ;ISSN: 0144-8617 ;EISSN: 1879-1344 ;DOI: 10.1016/j.carbpol.2014.11.019

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