Linked Life Data

19376890

Source:http://linkedlifedata.com/resource/pubmed/id/19376890

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pubmed-article:19376890pubmed:abstractTextThe induction of hydroxyl radical (OH) production via quinone redox cycling in white-rot fungi was investigated to improve pollutant degradation. In particular, we examined the influence of 4-methoxybenzaldehyde (anisaldehyde), Mn(2+), and oxalate on Pleurotus eryngii OH generation. Our standard quinone redox cycling conditions combined mycelium from laccase-producing cultures with 2,6-dimethoxy-1,4-benzoquinone (DBQ) and Fe(3+)-EDTA. The main reactions involved in OH production under these conditions have been shown to be (i) DBQ reduction to hydroquinone (DBQH(2)) by cell-bound dehydrogenase activities; (ii) DBQH(2) oxidation to semiquinone (DBQ(-)) by laccase; (iii) DBQ(-) autoxidation, catalyzed by Fe(3+)-EDTA, producing superoxide (O(2)(-)) and Fe(2+)-EDTA; (iv) O(2)(-) dismutation, generating H(2)O(2); and (v) the Fenton reaction. Compared to standard quinone redox cycling conditions, OH production was increased 1.2- and 3.0-fold by the presence of anisaldehyde and Mn(2+), respectively, and 3.1-fold by substituting Fe(3+)-EDTA with Fe(3+)-oxalate. A 6.3-fold increase was obtained by combining Mn(2+) and Fe(3+)-oxalate. These increases were due to enhanced production of H(2)O(2) via anisaldehyde redox cycling and O(2)(-) reduction by Mn(2+). They were also caused by the acceleration of the DBQ redox cycle as a consequence of DBQH(2) oxidation by both Fe(3+)-oxalate and the Mn(3+) generated during O(2)(-) reduction. Finally, induction of OH production through quinone redox cycling enabled P. eryngii to oxidize phenol and the dye reactive black 5, obtaining a high correlation between the rates of OH production and pollutant oxidation.lld:pubmed
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pubmed-article:19376890pubmed:authorpubmed-author:MartínezMaría...lld:pubmed
pubmed-article:19376890pubmed:authorpubmed-author:MartínezAngel...lld:pubmed
pubmed-article:19376890pubmed:authorpubmed-author:GuillénFranci...lld:pubmed
pubmed-article:19376890pubmed:authorpubmed-author:Gómez-Toribio...lld:pubmed
pubmed-article:19376890pubmed:authorpubmed-author:García-Martín...lld:pubmed
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pubmed-article:19376890pubmed:dateRevised2010-9-24lld:pubmed
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pubmed-article:19376890pubmed:articleTitleEnhancing the production of hydroxyl radicals by Pleurotus eryngii via quinone redox cycling for pollutant removal.lld:pubmed
pubmed-article:19376890pubmed:affiliationCentro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Madrid, Spain.lld:pubmed
pubmed-article:19376890pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:19376890pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed