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Título

Optimization of a laccase-mediator stage for TCF bleaching of flax pulp

AutorGarcía, Olga ; Camarero, Susana ; Colom, José F.; Martínez, Ángel T. ; Martínez, María Jesús ; Monje, R.; Vidal, Teresa
Palabras claveLaccase
Mediator
Optimization
Bleaching
TCF
Non-wood fibres
Flax
Fecha de publicación1-jun-2005
EditorWalter de Gruyter
CitaciónHolzforschung 57(5) 513–519 (2005)
ResumenFlax pulp obtained by anthraquinone-soda pulping, resulting in a kappa number of 11.1, a viscosity of 950 ml/g and 36.7% ISO brightness, was bleached in a totally chlorine-free sequence using the enzyme laccase from the fungus Pycnoporus cinnabarinus and 1-hydroxybenzotriazole (HBT) as redox mediator (stage L), followed by a hydrogen peroxide stage (P). The laccase treatment was optimized using a three-variable sequential statistical plan over the following ranges: 1–20 U/g o.d.p. (oven-dried pulp) laccase dose, 0.5–7.5% o.d.p. HBT dose and 1–24 h reaction time. The influence of these variables on several pulp properties after the P stage of the LP sequence was examined.The models defined from the results obtained predicted variations in ISO brightness, viscosity and kappa number of 57.6–74.8%, 590–955 ml/g and 0–6.2, respectively. The variables most strongly influencing these pulp properties were found to be the reaction time and the enzyme dose. A compromise was adopted as regards the operating conditions in order to ensure optimum results. The study was completed by conducting a biobleaching assay in a pressurized reactor (590 kPa) to assess the effect of oxygen pressure. The high pressure level resulted in improved pulp properties by the laccase-mediator system.
Descripción7 p.-3 fig.-3 tab.
Versión del editorhttp://dx.doi.org/10.1515/HF.2003.076
URIhttp://hdl.handle.net/10261/133769
DOI10.1515/HF.2003.076
ISSN0018-3830
E-ISSN1437-434X
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