Enzymatic modification of wood fibres for activating their ability of self bonding

Müller, Christian-Andreas; Euring, Markus; Kharazipour, Alireza

doi:10.1504/ijmpt.2009.027830

Cited by 17 publications

(11 citation statements)

References 23 publications

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“…Using laccase for bonding is based on the reactivity of phenoxy radicals in the plant cell wall. To some degree, the dosage of laccase determines the amount of generated phenoxy radicals (Felby et al 2002;Müller et al 2009). Figure 1 reveals the effect of the laccase dosage on the mechanical properties of binderless fiberboards with laccase-treated WSF.…”

Section: Resultsmentioning

confidence: 99%

“…Free radicals could act on sites for further cross-linking reactions. Simultaneously, as the reaction proceeds, the activated lignin molecules reacted among each other and became partially repolymerized (Müller et al 2009). Moreover, the surface of fibers generated a thin layer of depolymerized lignin depositions, which were helpful for the fiber bonding during the hot-pressing process (Maximova et al 2001;Felby et al 2002;Koljonen et al 2004;Nasir et al 2013).…”

Section: Fig 1 Effect Of Laccase Dosage On the Mechanical Propertiementioning

confidence: 99%

“…The effect of treatment time on the mechanical properties could be achieved by promoting or restricting the enzyme reaction. The reactions between laccase and lignin on the fiber surface were accomplished completely only in the first 2 h after incubation started because radicals remained the same or did not exhibit an obvious increase after two hours (Müller et al 2009). Therefore, three different treatment times: 60 min, 120 min, and 180 min, resp., were selected.…”

Section: Fig 1 Effect Of Laccase Dosage On the Mechanical Propertiementioning

confidence: 99%

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The Effect of Laccase Pretreatment Conditions on the Mechanical Properties of Binderless Fiberboards with Wheat Straw

Yang¹,

Song²,

Cao³

et al. 2017

BioResources

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Self-bonding technology is potentially an effective solution to overcome formaldehyde emissions, which pose health and environmental concerns. Laccases can activate the fiber surface during the binderless fiberboard manufacturing process. This paper adopted wheat straw fibers (WSF) as the main raw material. The purpose of this study was to examine the effects of laccase pretreatment conditions on the mechanical properties of binderless fiberboards produced from WSF. For the improvement of mechanical properties, bamboo fibers (BF) were added as a reinforcing material. In addition, differences in the effects of two processes for adding laccase on the mechanical properties were monitored. As a result, binderless fiberboards were successfully manufactured from laccasetreated WSF. The results showed that the optimized pretreatment conditions were determined to be a laccase dosage of 40 U per gram absolute dry fiber (U/g), a treatment time of 120 min, a treatment temperature of 50 °C, and a proportion of BF of 20%. The mechanical properties of the binderless fiberboards prepared using a water bath were superior to spraying under the same conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Fig 1 Effect Of Laccase Dosage On the Mechanical Propertiementioning

confidence: 99%

Section: Fig 1 Effect Of Laccase Dosage On the Mechanical Propertiementioning

confidence: 99%

See 1 more Smart Citation

The Effect of Laccase Pretreatment Conditions on the Mechanical Properties of Binderless Fiberboards with Wheat Straw

Yang¹,

Song²,

Cao³

et al. 2017

BioResources

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“…Therefore, to enhance at the same time reaction rates with iodide and oxidation rates of lignin, redox mediators were added in catalytic amounts. Synthetic (ABTS) and naturally derivable (acetosyringone [ACS] and 4-hydroxybenzoic acid [HBA]) laccase mediators were tested (9,12,42). The pH optima for mediator-enhanced oxidation of iodide were determined using the McIlvain citrate-phosphate buffer series.…”

Section: Methodsmentioning

confidence: 99%

Protection of Wood from Microorganisms by Laccase-Catalyzed Iodination

Schubert

Engel

Thöny‐Meyer

et al. 2012

Appl Environ Microbiol

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bIn the present work, Norway spruce wood (Picea abies L.) was reacted with a commercial Trametes versicolor laccase in the presence of potassium iodide salt or the phenolic compounds thymol and isoeugenol to impart an antimicrobial property to the wood surface. In order to assess the efficacy of the wood treatment, a leaching of the iodinated and polymerized wood and two biotests including bacteria, a yeast, blue stain fungi, and wood decay fungi were performed. After laccasecatalyzed oxidation of the phenols, the antimicrobial effect was significantly reduced. In contrast, the enzymatic oxidation of iodide (I ؊ ) to iodine (I 2 ) in the presence of wood led to an enhanced resistance of the wood surface against all microorganisms, even after exposure to leaching. The efficiency of the enzymatic wood iodination was comparable to that of a chemical wood preservative, VP 7/260a. The modification of the lignocellulose by the laccase-catalyzed iodination was assessed by the Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR) technique. The intensities of the selected lignin-associated bands and carbohydrate reference bands were analyzed, and the results indicated a structural change in the lignin matrix. The results suggest that the laccase-catalyzed iodination of the wood surface presents an efficient and ecofriendly method for wood protection.

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“…LMS application for the production of wood fiber composites offers many advantages. In addition to the independence from fossil oil resources, the use of LMS causes no extra emissions (either formaldehyde or volatile organic compounds, VOCs) out of the products (Müller et al 2009;Euring et al 2011Euring et al , 2013Euring et al , 2015Euring et al , 2016.…”

Section: Introductionmentioning

confidence: 99%

Pre-pressing and Pre-heating via Hot-Air/Hot-Steam Process for the Production of Binderless Medium-Density Fiberboards

Euring¹,

Kirsch²,

Kharazipour³

2016

BioResources

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The hot-air/hot-steam process was used for the first time as a combined pre-pressing and pre-heating system for the production of medium-density fiberboards (MDF) at the pilot scale. Pre-heating systems are designed to pre-heat fiber mats before pressing by hot-presses. Using such techniques, pressing times are reduced significantly and the board properties are influenced positively; both are essential for effective MDF production. In recent years, industry has searched for alternatives to petrochemical binders. Primarily, MDF are bonded by urea-formaldehyde (UF) resins in Europe. To replace UF resins, a laccase-mediator-system (LMS) was used to activate the wood fibers' self-cohesion. It was found that the internal bond strength (IB) and thickness swelling (TS) were noticeably improved by applying the hot-air/hot-steam process before final hot-pressing for both LMS and 10% UF binding systems. Simultaneously, the total pressing time could be reduced by 25% when combining the hotair/hot-steam process with hot-pressing.

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Enzymatic modification of wood fibres for activating their ability of self bonding

Cited by 17 publications

References 23 publications

The Effect of Laccase Pretreatment Conditions on the Mechanical Properties of Binderless Fiberboards with Wheat Straw

The Effect of Laccase Pretreatment Conditions on the Mechanical Properties of Binderless Fiberboards with Wheat Straw

Protection of Wood from Microorganisms by Laccase-Catalyzed Iodination

Pre-pressing and Pre-heating via Hot-Air/Hot-Steam Process for the Production of Binderless Medium-Density Fiberboards

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