Boosting the effect of a laccase–mediator system by using a xylanase stage in pulp bleaching

Valls, Cristina; Vidal, Teresa; Roncero, M. Blanca

doi:10.1016/j.jhazmat.2009.12.073

Cited by 42 publications

(30 citation statements)

References 31 publications

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“…In a continuation study, using the same pulp and enzyme sources, Valls et al [161] proceeded to vary laccase dose (1-20 units/g od pulp), mediator charge (0.5-2.5% od pulp), and time (1-7 h); the xylanase dose remained constant at 3 units/g od pulp. The pulp treated with the sequential XL treatment was determined to have a kappa number 1-2 units smaller than pulp treated only with an L stage, but brightness results were similar.…”

Section: Sequential Xylanase and Laccase Applicationmentioning

confidence: 99%

“…Valls et al [161] further determined that a shorter reaction time could effectively remove lignin, measured as kappa decrease, but there was not much change in brightness. In contrast, a longer reaction time did not result in much more lignin removal, since there was no further kappa change, but there was a brightness increase.…”

Section: Sequential Xylanase and Laccase Applicationmentioning

confidence: 99%

“…HexA units also cause brightness reversion and contribute to process scaling via calcium oxalate formation [49,166]. Xylanases can reduce HexA by releasing xylan from the fiber surface [49,158,161].…”

Section: Sequential Xylanase and Laccase Applicationmentioning

confidence: 99%

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Mixed Enzyme Systems for Delignification of Lignocellulosic Biomass

Woolridge

2014

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Abstract:The application of enzymes such as laccase and xylanase for the preparation of cellulose from lignocellulosic material is an option for those industries seeking to reduce the use of chlorine-containing bleach agents, thus minimizing the environmental impact of their processes. Mixed hydrolytic and oxidative enzyme systems have been well described in the context of biopulping, and thus provide good precedent regarding effectiveness, despite the susceptibility of xylanase to inactivation by laccase-generated oxidants. This paper examines the progress towards development of sequential and simultaneous mixed enzyme systems to accomplish delignification.

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Section: Sequential Xylanase and Laccase Applicationmentioning

confidence: 99%

Section: Sequential Xylanase and Laccase Applicationmentioning

confidence: 99%

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Mixed Enzyme Systems for Delignification of Lignocellulosic Biomass

Woolridge

2014

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“…Because of their wide reaction capability and broad substrate specificity, laccase enzymes possess great biotechnological potential (Kunamneni et al 2008b;Garcia-Ubasart et al 2012). The promising applications of laccase include textiledye bleaching (Mendonça Maciel et al 2010), pulp bleaching (Valls et al 2010), food improvement (Gochev and Krastanov 2007;Mendonça Maciel et al 2010), bioremediation of soils and water (Murugesan 2003;Bustos-Ramírez et al 2013), polymer synthesis , and the development of biosensors and biofuel cells (Kim et al 2014;Fokina et al 2015).…”

Section: Historical Developmentmentioning

confidence: 99%

Laccase, an Emerging Tool to Fabricate Green Composites: A Review

Mahmood¹,

Hashim²,

Sulaiman³

et al. 2015

BioResources

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In the last two decades, laccases have received much attention from researchers because of their specific ability to oxidize lignin. This function of laccase is very useful for applications in several biotechnological processes, including delignification in the pulp and paper industry and the detoxification of industrial effluents from the textile and petrochemical industries. This review focuses on laccase-mediated fiberboard synthesis. Growing concerns regarding the emission of formaldehyde from wood composites has prompted industrialists to consider the fabrication of green composites. Laccase-mediated fiber treatments oxidize the lignin component without affecting the cellulose structure. As a result, free radicals are generated on the fiber surface, and these can act as potential reactive sites for further cross-linking reactions in board manufacturing. Binderless fiberboards prepared using such methods can be considered as green composites because the manufacturing process involves no additional resin.

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“…Therefore, the replacement of natural compounds with alkali lignin as a mediator to assist laccase is of great interest. In addition, xylanase and cellulase have been incorporated to pretreat jute fragments, aimed at exposing more lignins on the surface by hydrolyzation of the other components and expanding the effects of laccase-mediated coupling, although several studies have reported the involvement of xylanase in the laccase/mediator-facilitated bleaching of pulps (Valls et al 2010;Thakur et al 2012).…”

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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Boosting the effect of a laccase–mediator system by using a xylanase stage in pulp bleaching

Cited by 42 publications

References 31 publications

Mixed Enzyme Systems for Delignification of Lignocellulosic Biomass

Mixed Enzyme Systems for Delignification of Lignocellulosic Biomass

Laccase, an Emerging Tool to Fabricate Green Composites: A Review

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

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