Enzymatic coating of lignocellulosic surfaces with polyphenols

Schroeder, Marc; Aichernig, N.; Guebitz, Georg M.; Kokol, Vanja

doi:10.1002/biot.200600209

Cited by 64 publications

(41 citation statements)

References 27 publications

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“…In addition, the high leachability of these compounds from the wood surface, decreasing their effectiveness, was evident from our results. In the literature the laccase-mediated biografting of natural phenols is postulated as an efficient method to circumvent leaching of antimicrobial phenolic compounds by binding them to lignocellulosic substrates without loss of their efficacy (25,48,51). Quite contrary to this, our results suggest that laccase-catalyzed polymerization of phenols to higher-molecularweight products caused a considerable reduction of their antimicrobial activity both on agar plates and on Norway spruce wood surfaces.…”

Section: Discussioncontrasting

confidence: 70%

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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Section: Discussioncontrasting

confidence: 70%

Protection of Wood from Microorganisms by Laccase-Catalyzed Iodination

Schubert

Engel

Thöny‐Meyer

et al. 2012

Appl Environ Microbiol

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“…One of the fields in which enzymes are increasingly capturing the interest of researchers across the globe is material science. There are several interesting examples describing the functionalization of natural fibers using enzymes in order to increase antibacterial properties [12], antioxidant capacity [12][13][14], or to increase compatibility with synthetic materials [15]. Nevertheless, it is still a challenge to find suitable enzymes for the biotransformation of non-natural and polymeric substrates.…”

Section: Introductionmentioning

confidence: 99%

A New Esterase from Thermobifida halotolerans Hydrolyses Polyethylene Terephthalate (PET) and Polylactic Acid (PLA)

et al. 2012

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Abstract:A new esterase from Thermobifida halotolerans (Thh_Est) was cloned and expressed in E. coli and investigated for surface hydrolysis of polylactic acid (PLA) and polyethylene terephthalate (PET). Thh_Est is a member of the serine hydrolases superfamily containing the -GxSxG-motif with 85-87% homology to an esterase from T. alba, to an acetylxylan esterase from T. fusca and to various Thermobifida cutinases. Thh_Est hydrolyzed the PET model substrate bis(benzoyloxyethyl)terephthalate and PET releasing terephthalic acid and mono-(2-hydroxyethyl) terephthalate in comparable amounts (19.8 and 21.5 mmol/mol of enzyme) while no higher oligomers like bis-(2-hydroxyethyl) terephthalate were detected. Similarly, PLA was hydrolyzed as indicated by the release of lactic acid. Enzymatic surface hydrolysis of PET and PLA led to a strong hydrophilicity increase, as quantified with a WCA decrease from 90.8° and 75.5° to 50.4° and to a complete spread of the water drop on the surface, respectively. OPEN ACCESSPolymers 2012, 4 618

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“…The defibrillation process can enhance the coupling effect of the laccase treatment, represented by increases in the tensile strength, tear strength, and burst strength of 39.7%, 28.6%, and 5.8%, respectively, from control to defibrillation/laccase treatment. This can be attributed to the fact that more lignins appeared on the jute surface through the defibrillation procedure, enabling the macromolecular laccase to contact and oxidize them (Schroeder et al 2007). …”

Section: Sem Analysismentioning

confidence: 99%

Enzymatic Treatments to Improve Mechanical Properties and Surface Hydrophobicity of Jute Fiber Membranes

Dong¹,

Fan²,

Wang³

et al. 2016

BioResources

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Fiber membranes prepared from jute fragments can be valuable, low cost, and renewable. They have broad application prospects in packing bags, geotextiles, filters, and composite reinforcements. Traditionally, chemical adhesives have been used to improve the properties of jute fiber membranes. A series of new laccase, laccase/mediator systems, and multi-enzyme synergisms were attempted. After the laccase treatment of jute fragments, the mechanical properties and surface hydrophobicity of the produced fiber membranes increased because of the cross-coupling of lignins with ether bonds mediated by laccase. The optimum conditions were a buffer pH of 4.5 and an incubation temperature of 60 °C with 0.92 U/mL laccase for 3 h. Laccase/guaiacol and laccase/alkali lignin treatments resulted in remarkable increases in the mechanical properties; in contrast, the laccase/2,2'-azino-bis-(3-ethylthiazoline-6-sulfonate) (ABTS) and laccase/2,6-dimethoxyphenol treatments led to a decrease. The laccase/ guaiacol system was favorable to the surface hydrophobicity of jute fiber membranes. However, the laccase/alkali lignin system had the opposite effect. Xylanase/laccase and cellulase/laccase combined treatments were able to enhance both the mechanical properties and the surface hydrophobicity of jute fiber membranes. Among these, cellulase/laccase treatment performed better; compared to mechanical properties, the surface hydrophobicity of the jute fiber membranes showed only a slight increase after the enzymatic multi-step processes.

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Enzymatic coating of lignocellulosic surfaces with polyphenols

Cited by 64 publications

References 27 publications

Protection of Wood from Microorganisms by Laccase-Catalyzed Iodination

Protection of Wood from Microorganisms by Laccase-Catalyzed Iodination

A New Esterase from Thermobifida halotolerans Hydrolyses Polyethylene Terephthalate (PET) and Polylactic Acid (PLA)

Enzymatic Treatments to Improve Mechanical Properties and Surface Hydrophobicity of Jute Fiber Membranes

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