Veratryl alcohol degradation by a catechol-driven Fenton reaction as lignin oxidation by brown-rot fungi model

Dihydroxybenzenes reduce Fe(III) to Fe(II), which react with H 2O 2 driving a Fenton reaction. This non-enzymic mechanism operates in wood degradation by brown-rot fungi, which mainly degrade wood carbohydrates and, to a lesser extent, lignin. Consequently, less attention has been focussed on lignin...

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Published in:International biodeterioration & biodegradation 2006, Vol.57 (1), p.63-68
Main Authors: Contreras, David, Freer, Juanita, Rodríguez, Jaime
Format: Article
Language:English
Subjects:
biodegradation
Brown-rot fungi
Catechol
Fenton reaction
hydrogen peroxide
iron
lignin
oxidation
phenolic compounds
reduction
Veratryl alcohol
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description Dihydroxybenzenes reduce Fe(III) to Fe(II), which react with H 2O 2 driving a Fenton reaction. This non-enzymic mechanism operates in wood degradation by brown-rot fungi, which mainly degrade wood carbohydrates and, to a lesser extent, lignin. Consequently, less attention has been focussed on lignin transformation by these organisms. In this work, the degradation of veratryl alcohol (VA), the simplest lignin model compound, via a Fenton reaction driven by 1,2-dihydroxybenzene (catechol, CAT) was studied. Multivariate analysis performed in order to determine the relationship between pH and concentrations of CAT, FeCl 3 and H 2O 2 showed that the highest VA degradation, 1 mol base, was obtained at the CAT:FeCl 3:H 2O 2 ratio of 0.375:0.375:5.0 at pH 3.4. Under these reaction conditions, VA degradation and mineralisation were, respectively, 3.8 and almost 40 times greater than for a Fe(II)-Fenton reaction.
doi_str_mv 10.1016/j.ibiod.2005.11.003
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subjects biodegradation
Brown-rot fungi
Catechol
Fenton reaction
hydrogen peroxide
iron
lignin
oxidation
phenolic compounds
reduction
Veratryl alcohol
title Veratryl alcohol degradation by a catechol-driven Fenton reaction as lignin oxidation by brown-rot fungi model
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