Kraft pulp biobleaching using an extracellular enzymatic fluid produced by Pycnoporus sanguineus

The aim of this work was to obtain a LMS pre-treatment applicable to industrial TCF bleaching. Kraft pulp from Eucalyptus globulus was treated at 40 °C/pH 3 and 60 °C/pH 5 for 1 h using an extracellular fluid enriched in laccase produced by Pycnoporus sanguineus and acetosyringone as mediator (HBT was used as a control mediator) (L). Alkaline extraction (E) and hydrogen peroxide (P) stages were then assayed. The LEP alternative was an efficient sequence to bleach kraft pulp since the enzymatic pre-treatment boosted the subsequent chemical bleaching. The best L pre-treatment was obtained with laccase-acetosyringone at 40 °C/pH 3. It reduces kappa number and hexenuronic acids, increases pulp viscosity, lowers hydrogen peroxide consumption down to an 87.4% (94.0% without L) and enhances brightness up to a 59% ISO (51% ISO without L). © 2009 Elsevier Ltd.

Bibliographic Details

Main Authors:	Eugenio Martín, María Eugenia, Santos, M., Carbajo, J. M., Martín, J. A., Martín-Sampedro, R., González, A. E., Villar, J. C.
Format:	artículo biblioteca
Language:	English
Published:	Elsevier 2010
Subjects:	Biobleaching, Fungal laccases, Kraft pulp, Pycnoporus sanguineus, Laccase–mediator system,
Online Access:	http://hdl.handle.net/20.500.12792/1271 http://hdl.handle.net/10261/291997
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