Hydrophobic properties conferred to Kraft pulp by a laccase-catalysed treatment with lauryl gallate

Reynaud, Céline; Tapin-Lingua, Sandra; Elegir, Graziano; Petit‐Conil, Michel; Baumberger, Stéphanie

doi:10.1016/j.jbiotec.2013.07.014

Cited by 19 publications

(23 citation statements)

References 17 publications

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“…The use of dodecyl gallate in the presence of Trametes villosa laccase was indeed very effective in removing HexA (82 % decrease), whereas a Pycnoporus cinnabarinus / p ‐coumaric acid treatment removed only 2.8 μmol g −1 (22 %) of the HexA present in the unbleached flax pulp (lignin content 1.4 %). Unlike what Reynaud and co‐workers observed, the kappa number was approximately twice as high after modification and subsequent acetone extraction, even though a low lignin content flax was used . Moreover, if lignin and HexA‐free pulp were used, almost no change in kappa number was detected.…”

Section: Laccase‐mediated Grafting On Lignocellulosescontrasting

confidence: 60%

“…Unlike what Reynaud and coworkers observed, the kappa number was approximately twice as high after modification and subsequent acetone extraction, even thoughalow lignin content flax was used. [65] Moreover,i f lignin andH exA-free pulp wereu sed, almostn oc hange in kappa number was detected. However,i fl ignin-free pulp with high HexA content was modified, an approximate twofold increase in kappa number was again observed.…”

Section: Graftingexamplesmentioning

confidence: 96%

“…After modification of the lignocellulosic material with a similar lignin content (>5 %) to that of jute and wood mentioned above, Reynaud et al. observed that after extraction a drop in kappa number coincided with a decrease in SWCA and an increase in water absorption rate (back to the level of unmodified material) . During lignocellulosic processing, some xylan monomers are converted into hexenuronic acids (HexAs; Scheme ); undesired olefinic chromophores that cause aging of the lignocelluloses.…”

Section: Laccase‐mediated Grafting On Lignocellulosesmentioning

confidence: 99%

“…Studies have shown that under some conditions the kappa number increases after laccase/gallate treatment, but drops again after extraction.A fter modification of the lignocellulosic material with as imilarl ignin content (> 5%)t ot hat of jute and wood mentioned above,Reynaud et al observed that after extraction ad rop in kappa number coincidedw ith ad ecrease in SWCA and an increasei nw ater absorption rate (back to the level of unmodified material). [65] During lignocellulosic processing, some xylan monomersa re converted into hexenuronic acids (HexAs;Scheme15);undesired olefinicc hromophores that cause aging of the lignocelluloses. Laccase/mediator treatments are known to decrease the HexA content of the material;t herefore, Cadenaa nd co-workerst ested p-coumaric acid and dodecyl gallate as mediators for the removal of HexA.…”

Section: Graftingexamplesmentioning

confidence: 99%

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Laccase‐Mediated Grafting on Biopolymers and Synthetic Polymers: A Critical Review

2017

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Laccase‐mediated grafting on lignocelluloses has gained considerable attention as an environmentally benign method to covalently modify wood, paper and cork. In recent decades this technique has also been employed to modify fibres with a polysaccharide backbone, such as cellulose or chitosan, to infer colouration, antimicrobial activity or antioxidant activity to the material. The scope of this approach has been further widened by researchers, who apply mediators or high redox potential laccases and those that modify synthetic polymers and proteins. In all cases, the methodology relies on one‐ or two‐electron oxidation of the surface functional groups or of the graftable molecule in solution. However, similar results can very often be achieved through simple deposition, even after extensive washing. This unintended adsorption of the active substance could have an adverse effect on the durability of the applied coating. Differentiating between actual covalent binding and adsorption is therefore essential, but proves to be challenging. This review not only covers excellent research on the topic of laccase‐mediated grafting over the last five to ten years, but also provides a critical comparison to highlight either the lack or presence of compelling evidence for covalent grafting.

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Section: Laccase‐mediated Grafting On Lignocellulosescontrasting

confidence: 60%

Section: Graftingexamplesmentioning

confidence: 96%

Section: Laccase‐mediated Grafting On Lignocellulosesmentioning

confidence: 99%

Section: Graftingexamplesmentioning

confidence: 99%

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Laccase‐Mediated Grafting on Biopolymers and Synthetic Polymers: A Critical Review

2017

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“…These mediators can be synthetic mediators (Bourbonnais et al 1997;Camarero et al 2004) such as 2,2'-azino-bis-(3-ethylthiazoline-6-sulfonate) (ABTS) and 1-hydroxybenzotriazole (HBT), as well as natural mediators with higher redox potential (Camarero et al 2007;Fillat et al 2010;Barneto et al 2012) such as syringaldehyde (SA) and acetosyringone (AS), which can be activated by laccase to oxidize the non-phenolic units dominating the lignin structure. In addition, laccaseoxidized (radical-containing) phenols or non-oxidized amines of foreign interest can also be grafted to radicalized lignins or lignocellulosic surfaces to produce engineered materials with novel functions (Lund and Ragauskas 2001;Elegir et al 2008;Witayakran and Ragauskas 2009;Pei et al 2013;Reynaud et al 2014).…”

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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Enzymatic Modification of Cellulose To Unlock Its Exploitation in Advanced Materials

2020

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Nowadays natural biopolymers have a wide variety of uses in various industrial applications, such as food, adhesives and composite materials. Among them, cellulose has attracted the interest of researchers due to its properties: high strength and flexibility, biocompatibility and nontoxicity. Despite that, in many cases its practical use is limited because of poor solubility and/or an unsuitable hydrophilic/hydrophobic balance. In this context, enzymatic modification appears as a powerful strategy to overcome these problems through selective, green and environmentally friendly processes. This minireview discusses the different methods developed for the enzymatic modification of cellulose, emphasizing the type of reaction, the enzymes used (laccases, esterases, lipases, hexokinases, etc.), and the properties and applications of the cellulose derivatives obtained. Considering that cellulose is the most abundant natural polymer on Earth and can be derived from residual lignocellulosic biomass, the impact of its use in bio‐based process following the logic of the circular economy is relevant.

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Hydrophobic properties conferred to Kraft pulp by a laccase-catalysed treatment with lauryl gallate

Cited by 19 publications

References 17 publications

Laccase‐Mediated Grafting on Biopolymers and Synthetic Polymers: A Critical Review

Laccase‐Mediated Grafting on Biopolymers and Synthetic Polymers: A Critical Review

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

Enzymatic Modification of Cellulose To Unlock Its Exploitation in Advanced Materials

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