Effect of heat treatment on extracellular enzymatic activities involved in beech wood degradation by Trametes versicolor

Lekounougou, S.; Pétrissans, Mathieu; Jacquot, Jean‐Pierre; Gelhaye, Éric; Gérardin, Philippe

doi:10.1007/s00226-008-0236-z

Cited by 40 publications

(31 citation statements)

References 22 publications

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“…Rowell (2005) proposed that fungal enzymes are unable to recognize their substrates in modified wood (Figure 2A). This theory may be supported by the fact that hemicellulases and cellulases are less efficient in thermally modified, DMDHEU-treated, and furfurylated wood (Lekounougou et al 2008;Venås 2008;Verma and Mai 2010). Their action is, however, not inhibited.…”

Section: Role Of Accessible Nutrientsmentioning

confidence: 96%

“…The number of available (free) OH-groups is increased in DMDHEUtreated wood, which supports the subordinate role of free OH-groups in decay resistance (Dieste et al 2009a). The loss of water from glycosidic bonds may reduce the efficiency of fungal hydrolases but not completely inhibit it (Lekounougou et al 2008;Venås 2008;Verma and Mai 2010). Furthermore, oxidative degradation would not be affected.…”

Section: Exclusion Of Moisture Via the Reduction Of Accessible Oh-groupsmentioning

confidence: 99%

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Mode of action of brown rot decay resistance in modified wood: a review

Ringman

Pilgård²,

Brischke

et al. 2013

Holzforschung

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Chemically or physically modified wood materials have enhanced resistance to wood decay fungi. In contrast to treatments with traditional wood preservatives, where the resistance is caused mainly by the toxicity of the chemicals added, little is known about the mode of action of nontoxic wood modification methods. This study reviews established theories related to resistance in acetylated, furfurylated, dimethylol dihydroxyethyleneurea-treated, and thermally modified wood. The main conclusion is that only one theory provides a consistent explanation for the initial inhibition of brown rot degradation in modified wood, that is, moisture exclusion via the reduction of cell wall voids. Other proposed mechanisms, such as enzyme nonrecognition, micropore blocking, and reducing the number of free hydroxyl groups, may reduce the degradation rate when cell wall water uptake is no longer impeded.

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Section: Role Of Accessible Nutrientsmentioning

confidence: 96%

Section: Exclusion Of Moisture Via the Reduction Of Accessible Oh-groupsmentioning

confidence: 99%

Mode of action of brown rot decay resistance in modified wood: a review

Ringman

Pilgård²,

Brischke

et al. 2013

Holzforschung

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“…During treatment, hemicelluloses and amorphous cellulose are strongly degraded, while lignin is believed to undergo thermo-crosslinking reactions [6e14]. More recently, it has been shown that chemical modification of wood polysaccharides is the origin of the improvement of wood durability [15]. Due to the importance of dehydration reactions during heat treatment, we have investigated the changes of atomic O/C ratio as a potential marker to evaluate intensity of heat treatment using different methods like XPS [16] or microanalyses [17].…”

Section: Introductionmentioning

confidence: 99%

Prediction of the decay resistance of heat treated wood on the basis of its elemental composition

Šušteršic

Mohareb

Chaouch

et al. 2010

Polymer Degradation and Stability

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“…Hemicellulose, amorphous cellulose, and lignin are subject to degradation or modification, and the extractives evaporate or polymerize (Viitaniemi et al 2002). Thermal modification alters the chemical properties of wood (Weiland and Guyonnet 2003), making heat-treated wood more resistant to decay (Lekounougou et al 2009). The optimal temperature and time of such heat treatment varies among non-naturally resistant wood species (Kamdem et al 2002, Calonego et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Changes in the chemical structure and decay resistance of heat-treated narrow-leaved ash wood

Yalçın

Şahin

2015

Maderas, Cienc. tecnol.

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We analyzed the effects of heat treatment on the chemical structure of wood from narrow-leafed Ash (Fraxinus angustifolia), a fast-growing and economically valuable species. We also analyzed the effects of heat treatment on the wood's resistance to four decay fungi. Narrow-leafed Ash wood samples were heated with saturated steam to 140, 180, 200, and 220°C for 2, 4, and 6 h. The relative contents of extractable components were analyzed, as well as the levels of holocellulose, cellulose, and lignin. In addition, the density, equilibrium moisture content, and pH of the samples were measured. To determine the effects of heat treatment on resistance to decay fungi, the samples were exposed to the white rot fungus Trametes versicolor, dry rot fungus Serpula lacrymans, and the brown rot fungi Coniophora puteana and Gloeophyllum trabeum. Changes in the chemical composition of the wood due to heat treatment were correlated with increased resistance to fungal decay. While the hemicellulose content was dramatically reduced with increasing temperature and treatment duration, the lignin content increased proportionately. Thus, heat treatment is an environmentally friendly method of preserving narrow-leafed Ash wood against various decay fungi.

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Effect of heat treatment on extracellular enzymatic activities involved in beech wood degradation by Trametes versicolor

Cited by 40 publications

References 22 publications

Mode of action of brown rot decay resistance in modified wood: a review

Mode of action of brown rot decay resistance in modified wood: a review

Prediction of the decay resistance of heat treated wood on the basis of its elemental composition

Changes in the chemical structure and decay resistance of heat-treated narrow-leaved ash wood

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