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• W2020338713 abstract "Summary The fungi that cause brown rot of wood initiate lignocellulose breakdown with an extracellular Fenton system in which Fe 2+ and H 2 O 2 react to produce hydroxyl radicals (·OH), which then oxidize and cleave the wood holocellulose. One such fungus, Gloeophyllum trabeum , drives Fenton chemistry on defined media by reducing Fe 3+ and O 2 with two extracellular hydroquinones, 2,5‐dimethoxyhydroquinone (2,5‐DMHQ) and 4,5‐dimethoxycatechol (4,5‐DMC). However, it has never been shown that the hydroquinones contribute to brown rot of wood. We grew G. trabeum on spruce blocks and found that 2,5‐DMHQ and 4,5‐DMC were each present in the aqueous phase at concentrations near 20 μM after 1 week. We determined rate constants for the reactions of 2,5‐DMHQ and 4,5‐DMC with the Fe 3+ ‐oxalate complexes that predominate in wood undergoing brown rot, finding them to be 43 l mol −1 s −1 and 65 l mol −1 s −1 respectively. Using these values, we estimated that the average amount of hydroquinone‐driven ·OH production during the first week of decay was 11.5 μmol g −1 dry weight of wood. Viscometry of the degraded wood holocellulose coupled with computer modelling showed that a number of the same general magnitude, 41.2 μmol oxidations per gram, was required to account for the depolymerization that occurred in the first week. Moreover, the decrease in holocellulose viscosity was correlated with the measured concentrations of hydroquinones. Therefore, hydroquinone‐driven Fenton chemistry is one component of the biodegradative arsenal that G. trabeum expresses on wood." @default.
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• W2020338713 date "2006-10-25" @default.
• W2020338713 modified "2023-10-16" @default.
• W2020338713 title "Fungal hydroquinones contribute to brown rot of wood" @default.
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• W2020338713 doi "https://doi.org/10.1111/j.1462-2920.2006.01160.x" @default.
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