Delignification of eucalypt kraft pulp with manganese-substituted polyoxometalate assisted by fungal versatile peroxidase
authors Marques, G; Gamelas, JAF; Ruiz-Duenas, FJ; del Rio, JC; Evtuguin, DV; Martinez, AT; Gutierrez, A
nationality International
journal BIORESOURCE TECHNOLOGY
author keywords Polyoxometalate; Versatile peroxidase; Oxidative delignification; Pulp bleaching; Eucalypt kraft pulp
keywords SITE-DIRECTED MUTAGENESIS; OXYGEN DELIGNIFICATION; PLEUROTUS-ERYNGII; OXIDATION; ENZYMES; SYSTEM; ECF
abstract Oxidation of the manganese-substituted polyoxometalate [SiW(11)Mn(II)(H(2)O)O(39)](6-) (SiW(11)Mn(II)) to [SiW(11)Mn(II)(H(2)O)O(39)](5-) (SiW(11)Mn(II)), one of the most selective polyoxometalates for the kraft pulp delignification, by versatile peroxidase (VP) was studied. First, SiW(11)Mn(II) was demonstrated to be quickly oxidized by VP at room temperature in the presence of H(2)O(2) (K(m)= 6.4 +/- 0.7 mM and k(car) = 47 +/- 2 s(-1)). Second, the filtrate from eucalypt pulp delignification containing reduced polyoxometalate was treated with VP/H(2)O(2), and 95-100% reoxidation was attained. In this way, it was possible to reuse the liquor from a first SSiW(11)Mn(III) stage for further delignification, in a sequence constituted by two polyoxometalate stages, and a short intermediate step consisting of the addition of VP/H(2)O(2) to the filtrate for SiW(11)Mn(II) reoxidation. When the first ClO(2) stage of a conventional bleaching sequence was substituted by the two-stage delignification with polyoxometalate (assisted by VP) a 50% saving in ClO(2) was obtained for similar mechanical strength of the final pulp. (C) 2010 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0960-8524
year published 2010
volume 101
issue 15
beginning page 5935
ending page 5940
digital object identifier (doi) 10.1016/j.biortech.2010.02.093
web of science category Agricultural Engineering; Biotechnology & Applied Microbiology; Energy & Fuels
subject category Agriculture; Biotechnology & Applied Microbiology; Energy & Fuels
unique article identifier WOS:000278035900028
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journal impact factor 5.807
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