Laccase-assisted surface functionalization of lignocellulosics

Kalia, Susheel; Thakur, Kamini; Kumar, Amit; Celli, Annamaria

doi:10.1016/j.molcatb.2014.01.014

Cited by 48 publications

(32 citation statements)

References 103 publications

(125 reference statements)

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“…Therefore, the use of enzymes as biocatalysts in the surface processing of lignocellulosic polymers has increased dramatically in recent years [13][14][15][16][17][18]. Enzymatic processes have numerous advantages such as specificity, cost effective, eco-friendly, mild reaction conditions than the chemical methods.…”

Section: Page 4 Of 39mentioning

confidence: 99%

“…The lignins isolated from jute fabrics were analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), 1 H-NMR, 13 C-NMR, and heteronuclear single quantum correlation (HSQC)-NMR. The surface of the jute fabrics was characterized by FT-IR, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM).…”

Section: Page 5 Of 39mentioning

confidence: 99%

“…The 1 H-NMR, 13 C-NMR, and HSQC 2D-NMR spectra of 50 mg acetylated lignins and 25 mg OA monomer dissolved in 500 µL deuterated chloroform (CDCl 3 ) were recorded using a Bruker AVANCE 400 MHz spectrometer.…”

Section: Nmr Analysismentioning

confidence: 99%

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Hydrophobic surface functionalization of lignocellulosic jute fabrics by enzymatic grafting of octadecylamine

Dong

Fan

Wang

et al. 2015

International Journal of Biological Macromolecules

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Enzymatic grafting of synthetic molecules onto lignins provides a mild and eco-friendly alternative for the functionalization of lignocellulosic materials. In this study, laccase-mediated grafting of octadecylamine (OA) onto lignin-rich jute fabrics was investigated for enhancing the surface hydrophobicity. First, the lignins in jute fabrics were isolated and analyzed in the macromolecular level by MALDI-TOF MS, (1)H NMR, (13)C NMR, and HSQC-NMR. Then, the surface of jute fabrics was characterized by FT-IR, XPS, and SEM. Subsequently, the nitrogen content of jute fabrics was determined by the micro-Kjeldahl method, and the grafting percentage (Gp) and grafting efficiency (GE) of the enzymatic reaction were calculated. Finally, the surface hydrophobicity of the jute fabrics was estimated by contact angle and wetting time measurements. The results indicate that the OA monomers were successfully grafted onto the lignin moieties on the jute fiber surface by laccase with Gp and GE values of 0.712% and 10.571%, respectively. Moreover, the modified jute fabrics via OA-grafting showed an increased wetting time of 18.5 min and a contact angle of 116.72°, indicating that the surface hydrophobicity of the jute fabrics increased after the enzymatic grafting modification with hydrophobic OA molecules.

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Section: Page 4 Of 39mentioning

confidence: 99%

Section: Page 5 Of 39mentioning

confidence: 99%

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Hydrophobic surface functionalization of lignocellulosic jute fabrics by enzymatic grafting of octadecylamine

Dong

Fan

Wang

et al. 2015

International Journal of Biological Macromolecules

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“…In recent decades, enzymatic technology has been widely employed in the processing of lignocellulose-based materials, which include wood, fiberboards, plant fibers, and pulp (Hüttermann et al 2001;Kudanga et al 2008Kudanga et al , 2010Nyanhongo et al 2011;Zhou et al 2013a;Kalia et al 2014;Nasir et al 2015). The enzymatic processes have the merits of substrate specificity, low cost, eco-friendliness, and mild operating conditions.…”

Section: Introductionmentioning

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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“…Additional examples include hemicellulase, which is capable of reducing the beating energy and improving the quality of paper (Stork et al 1995), peroxidase, which plays an important role in the degradation process of lignin, and laccase, which is the most promising lignin-degrading and lignin-polymerizing enzyme (Thurston 1994). This is because laccase is an environmentally friendly enzyme, which works in the presence of oxygen and produces water as its only byproduct (Kalia et al 2014). In addition, laccase can be used for many technical processes (Call and Mücke 1997;Couto and Toca-Herrera 2006;Riva 2006;Mikolasch and Schauer 2009), such as bio-bleaching in the pulp and paper industry (Balakshin et al 2001;Zhang et al 2007), decreasing the refining energy (Mansfield 2002), deinking of waste paper pulp (Welt and Dinus 1998;Ibarra et al 2012), lignin degradation (Rico et al 2014), and dyeing in the textile industry (Galante and Formantici 2003).…”

Section: Introductionmentioning

confidence: 99%

Structural Analysis of Fast-Growing Aspen Alkaline Peroxide Mechanical Pulp Lignin: A Post-Enzymatic Treatment

et al. 2016

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An enzymatic mild acidic hydrolysis was used to separate and purify residual lignin from alkaline peroxide mechanical pulp (APMP). Using the optimum conditions for the laccase treatment (pH 4.5, temperature 50 °C, lignin consistency of 1%, a reaction time of 60 min, and a laccase dosage of 8 μ/g), oven-dried lignin was treated with laccase and in a laccase mediator system (LMS) to explore the mechanism for laccase and the LMS modification of APMP. The changes of functional groups in lignin were analyzed using nuclear magnetic resonance ( C-NMR spectra revealed that the lignin structure changed significantly with the laccase and the LMS treatments. Meanwhile, GPC demonstrated that laccase without a mediator could lead to the polymerization of lignin, while the LMS could degrade the lignin. Hence, it was concluded that laccase is an attractive enzyme for lignin modification.

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Laccase-assisted surface functionalization of lignocellulosics

Cited by 48 publications

References 103 publications

Hydrophobic surface functionalization of lignocellulosic jute fabrics by enzymatic grafting of octadecylamine

Hydrophobic surface functionalization of lignocellulosic jute fabrics by enzymatic grafting of octadecylamine

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

Structural Analysis of Fast-Growing Aspen Alkaline Peroxide Mechanical Pulp Lignin: A Post-Enzymatic Treatment

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