Laccase-Mediator Biobleaching Applied to a Direct Yellow Dyed Paper

Knutson, Kristina; Ragauskas, Arthur J.

doi:10.1021/bp049833+

Cited by 26 publications

(11 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sulfur species act as electron mediators between AQ and lignin macromolecules. Electron mediators play an essential role in enzymatic delignifi cation of lignocellulosic materials (Bourbonnais et al 1997 ;Kutnson and Ragauskas 2004 ). The present paper confi rms the mediator concept, as similar EGs were observed for commercial AQ, linear hydrophobic CP-B and crosslinked CP-3D polymers, showing that neither steric hindrance nor solubility were a limiting factor for catalysis in the presence of sodium sulfi de.…”

Section: Resultssupporting

confidence: 84%

Anthraquinone polymer catalysts for alkaline delignification of lignocellulosic matter. Part 3. Delignification of softwood and action on a phenolic β-O-4 lignin model in kraft pulping conditions

Cazeils¹,

Megiatto²,

Gardrat

et al. 2012

Holzforschung

View full text Add to dashboard Cite

The delignifi cation action of four new anthraquinone (AQ) polystyrene catalysts -three of them linear ( CP-A , CP-B , CP-C) and one cross-linked ( CP-3D ) -were investigated on softwood ( Pinus pinaster ) chips under kraft pulping conditions, and their catalytic effi ciency gains (EGs) were compared to that of AQ, with EG AQ = 100. The catalytic EG of the hydrophobic polymers CP-B and CP-3D was 96 % , while the inherent hydrophilic catalyst CP-C showed an EG of 30 % . Interpretation: hydrogen sulfi de anions presented in the kraft pulp liquor might participate in the delignifi cation mechanisms as redox active mediators in the case of the hydrophobic polymers. Moreover, the latter could be recovered after pulping, and delignifi cation tests with the recovered materials revealed that they preserved their catalytic properties. Mechanistic studies were carried out with a phenolic β -O-4 lignin model compound in the presence or absence of glucose (mimicking the carbohydrate end groups) and/or NaSH. It was shown that the cross-linked CP-3D polymer reacted with the lignin model through electron transfer reactions, a process most likely mediated by glucose and HS -redox active species. The concept of grafting AQ into polymeric substrates is discussed in terms of reusable delignifi cation catalysts for large-scale pulping processes under kraft conditions.

show abstract

Section: Resultssupporting

confidence: 84%

Anthraquinone polymer catalysts for alkaline delignification of lignocellulosic matter. Part 3. Delignification of softwood and action on a phenolic β-O-4 lignin model in kraft pulping conditions

Cazeils¹,

Megiatto²,

Gardrat

et al. 2012

Holzforschung

View full text Add to dashboard Cite

show abstract

“…The laccase/ABTS system developed for treatment of Direct Yellow 11 (Knutson & Ragauskas 2004) was tested for its ability to decolorize Basazol 46L dye. Since laccase uses O 2 as an electron source, the solution concentration of O 2 was increased by performing the reaction with stirring under 1000 kPa O 2 pressure.…”

Section: Laccase-mediator System Treatment Of Basazol 46l Dyementioning

confidence: 99%

“…The development of a laccase mediator system utilizing 2, 2¢-azinobis-(3-ethylbenzthiazoline-6-sulfonate), ABTS, as mediator to decolorize pulp dyed with Direct Yellow 11 has been recently reported (Knutson & Ragauskas 2004). This study examines the relative reaction rates for laccase/ ABTS and soybean peroxidase biobleaching.…”

Section: Introductionmentioning

confidence: 99%

Enzymatic Biobleaching of Two Recalcitrant Paper Dyes with Horseradish and Soybean Peroxidase

2005

View full text Add to dashboard Cite

show abstract

“…This is an unfinished search, as there is still no suitable mediator for the different applications of the LMSs. Synthetic organic compounds (Claus et al 2002;Knutson and Ragauskas 2004), lignin-derived compounds , compounds naturally produced by fungi (Johannes and Majcherczyk 2000), phenolic compounds (Kang et al 2002) and polyoxometalates (Gamelas et al 2005) have all been tested in different applications as mediators in LMSs.…”

Section: Introductionmentioning

confidence: 99%

Amelioration of the ability to decolorize dyes by laccase: relationship between redox mediators and laccase isoenzymes in Trametes versicolor

Moldes

Sanromán

2006

World J Microbiol Biotechnol

View full text Add to dashboard Cite

The effect of redox mediators in the dye decolorization by two laccase isoenzymes from Trametes versicolor cultures supplemented with barley bran has been investigated. All the redox mediators tested, 1-hydroxybenzotriazole (HBT), promazine (PZ), para-hydroxybenzoic acid (pHBA) and 1-nitroso-2-naphthol-3,6-disulfonic acid (NNDS), led to higher dye decolorization than those obtained without mediator addition. Among the different tested mediators, PZ was the most effective one at a low range of concentration (0.5-50 lM) and the natural mediator employed, pHBA did not improve significantly the degree of decolorization, and was slightly inhibitory.The two laccase isoenzymes, LacI and LacII, showed different decolorization capability depending on the mediator used. No significant differences were detected for NNDS, however LacII was more effective than LacI in the presence of PZ, while in the presence of HBT LacI was the fastest and the most effective isoenzyme.

show abstract

Laccase-Mediator Biobleaching Applied to a Direct Yellow Dyed Paper

Cited by 26 publications

References 13 publications

Anthraquinone polymer catalysts for alkaline delignification of lignocellulosic matter. Part 3. Delignification of softwood and action on a phenolic β-O-4 lignin model in kraft pulping conditions

Anthraquinone polymer catalysts for alkaline delignification of lignocellulosic matter. Part 3. Delignification of softwood and action on a phenolic β-O-4 lignin model in kraft pulping conditions

Enzymatic Biobleaching of Two Recalcitrant Paper Dyes with Horseradish and Soybean Peroxidase

Amelioration of the ability to decolorize dyes by laccase: relationship between redox mediators and laccase isoenzymes in Trametes versicolor

Contact Info

Product

Resources

About