Studying the effects of laccase treatment in a softwood dissolving pulp: cellulose reactivity and crystallinity
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 brightnes...
| Autores: | , , , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2014 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/26885 |
| Acesso em linha: | https://hdl.handle.net/2117/26885 https://dx.doi.org/10.1016/j.carbpol.2014.11.019 |
| Access Level: | acceso abierto |
| Palavra-chave: | Cellulose Wood-pulp--Bleaching Alkali solubility Dissolving pulp Thermogravimetric analysis (TGA) Violuric acid a-Cellulose Pasta de paper -- Blanqueig Cel·lulosa per a paper Àrees temàtiques de la UPC::Enginyeria paperera::Primeres matèries papereres::Cel·lulosa Àrees temàtiques de la UPC::Enginyeria paperera::Pasta paperera::Blanqueig de pastes |
| Resumo: | 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 |
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