期刊
BIORESOURCE TECHNOLOGY
卷 101, 期 6, 页码 1866-1870出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.09.084
关键词
Biobleaching; Fungal laccases; Kraft pulp; Pycnoporus sanguineus; Laccase-mediator system
资金
- Spanish Ministry of Science and Innovation [CTQ 2006-00385 PPQ]
- Ramon y Cajal Programme
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 degrees C/pH 3 and 60 degrees 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 degrees 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). (C) 2009 Elsevier Ltd. All rights reserved.
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