Impact of xylanase pre-treatment on peroxide bleaching stage of biokraft pulp

Atik, Celil; İmamoğlu, Sami; Bermek, Hakan

doi:10.1016/j.ibiod.2006.04.003

Cited by 18 publications

(8 citation statements)

References 7 publications

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“…So far, the strains used in biopulping studies derive from North America (e.g. FP-90031, CZ-3, ATCC 90467; Akhtar et al 1992;Amirta et al 2006;Atik et al 2006;Galkin et al 1998;Harreither et al 2007). Gelatoporia subvermispora has been described from North America, so it is the Eurasian species that would require a new name in case there are two species involved instead of one.…”

Section: Resultsmentioning

confidence: 99%

Obba and Sebipora, new polypore genera related to Cinereomyces and Gelatoporia (Polyporales, Basidiomycota)

Miettinen

Rajchenberg

2011

Mycol Progress

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Cinereomyces clade is a newly proposed monophyletic group of polypores containing currently four genera and five species, including two promising biopulping fungi, Ceriporiopsis rivulosa and C. subvermispora. The Cinereomyces clade is well-delimited in nrDNA-based phylogenetic analysis, but its position in Polyporales remains unclear. Its closest relative may be found in the core polyporoid clade. Only a few morphological characters are common for all the species in the clade, e.g. CB-and CRB+ hyphae, white fruiting bodies, presence of oil, and middlesized spores. Culturally, the species are unified by producing simple-septate generative hyhpae in the margin, which produce simple-clamped hyphae backwards. The genus Gelatoporia is the correct place for Ceriporiopsis subvermispora. Two new genera are described in the group: Obba to incorporate C. rivulosa and a new austral species, Obba valdiviana, known from southern Argentina and recorded here also from Tasmania, and Sebipora to accommodate a new species from tropical Asia, S. aquosa. ITS sequences imply that Eurasian Gelatoporia subvermispora may belong to a different species from the North American one. G. subvermispora is recorded as new to Indonesia.

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Section: Resultsmentioning

confidence: 99%

Obba and Sebipora, new polypore genera related to Cinereomyces and Gelatoporia (Polyporales, Basidiomycota)

Miettinen

Rajchenberg

2011

Mycol Progress

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“…no great modifications of mechanical properties were observed after a xylanase treatment. Atik et al (2006) reported that a significant difference due to the xylanase enzyme treatment of pulp was not found in tensile or bursting strength properties of aspen wood pulps. Unbleached softwood kraft pulp treated with Pulpzyme HC had a decreased freeness with minimal changes in tear and tensile index at a given apparent density; i.e.…”

Section: Effect Of Enzyme Treatment On Strength and Optical Properties mentioning

confidence: 99%

Studies on Xylanase and Laccase Enzymatic Prebleaching to Reduce Chlorine-Based Chemicals During Ceh and Ecf Bleaching

Thakur¹,

Jain²,

Mathur³

2012

BioResources

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The biobleaching efficiency of xylanase and laccase enzymes was studied on kraft pulps from wood and nonwood based raw materials employed in the Indian paper industry. Treatment of these pulps with xylanase enzyme could result in improved properties, showing 2.0% ISO gain in pulp brightness and/or reducing the demand of chlorine-based bleach chemicals by up to 15% with simultaneous reduction of 20 to 25% in AOX generation in bleach effluents. Further, mill-scale trial results revealed that enzymatic prebleaching can be successfully employed with xylanases to reach the same bleach boosting efficacy. Laccase bleaching was also studied on hardwood pulp at a pH around 8.0, where most of the pulp mills in India are operating, in contrast to earlier studies on laccase enzyme bleaching, which were conducted at acidic pHs, i.e. 4.0 to 5.0. In case of laccase bleaching, interesting results were found wherein a bleach-boosting effect was observed even at pH 8.0. Further studies carried out with HOBT as mediator in comparison to the commonly used and expensive ABTS laccase mediator system (LMS) resulted in improvement of the bleaching efficiency with reduction in demand of chlorine dioxide by more than 35%. Potential for further reduction was indicated by the brightness gain, when compared with a control using the DE(p)D bleach sequence.

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“…These fungi possess hydrolytic enzymes like cellulases, pectinases, xylanases and, ligninolytic complex composed of lignin peroxidase (LiP) and manganese peroxidase (MnP) and laccase, which in general are triggered by their substrates (Ander and Eriksson 1977). Most of these enzymes are industrially important and therefore, studies of new organisms able to produce these enzymes are interesting for their potential use in processes like bioremediation, biodegradation, biopulping, degradation and detoxification of recalcitrant substances (Atik et al 2006;Durán and Esposito 2000;Husain 2006; Gianfreda and Rao 2004;Tortella et al 2005). Thus, the enzymatic characterization and application of Phanerochaete chrysosporium has received particular attention (Tien and Kirk 1983;de Koker et al 1998;Kersten and Cullen 2007).…”

Section: Introductionmentioning

confidence: 99%

Enzymatic characterization of Chilean native wood-rotting fungi for potential use in the bioremediation of polluted environments with chlorophenols

Rubilar

Gianfreda

Valenzuela

et al. 2008

World J Microbiol Biotechnol

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This work presents a preliminary report of a series of studies on the ability of several indigenous wood-rotting fungi from Chile to produce hydrolytic and ligninolytic enzymes and the evaluation of these native microorganism to future research on potential applications in bioremediation programs. Wood-rotting Basidiomycete fungi were collected from indigenous hardwood forest in the South of Chile. Twenty-eight strains were identified and qualitative enzymatic tests for peroxidases, laccase, tyrosinase, xylanase and cellulase production were performed in solid medium. Eleven selected strains were evaluated in liquid medium to quantify their ligninolytic enzyme production and their capacity to grow in solid medium supplemented with 2,4-dichlorophenol (2,4-DCF), 2,4,6-trichlorophenol (2,4,6-TCF) and pentachlorophenol (PCP). PCP degradation and ligninolytic enzymes production were also evaluated in liquid medium. Results showed that laccase was present in 28 of the selected strains (&73%). Peroxidase was present in 40% and cellulase in 37% of the strains. Xilanase and tyrosinase were obtained in a smaller percentage in the strains (28% and 7%, respectively). The 11 selected strains showed high concentrations of lignin peroxidase (Lip) and manganese peroxidase (MnP). Anthracophyllum discolor (Sp4), produced LiP and MnP at 90.3 and MnP 125.5 U L -1 respectively, compared to the control fungus Phanerochaete chrysosporium CECT-2798 that produced 58.1 and 118.4 U L -1 of LiP and MnP. Tolerance test showed that native Chilean fungi did not present high tolerance to 2,4,6-TCF and PCP but were quite tolerant to 25 and 50 mg L -1 of 2,4-DCF. However, pre-acclimatization in 2,4-DCP notably improved the growth in medium with 2,4,6-TCP and PCP. PCP in liquid medium was efficiently degraded by the fungi Anthracophyllum discolor, Lenzites betulina (Ru-30) and Galerina patago´nica (Sp3), and the major MnP activity was produced by A. discolor (Sp4) (67 U L -1 ).

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Impact of xylanase pre-treatment on peroxide bleaching stage of biokraft pulp

Cited by 18 publications

References 7 publications

Obba and Sebipora, new polypore genera related to Cinereomyces and Gelatoporia (Polyporales, Basidiomycota)

Obba and Sebipora, new polypore genera related to Cinereomyces and Gelatoporia (Polyporales, Basidiomycota)

Studies on Xylanase and Laccase Enzymatic Prebleaching to Reduce Chlorine-Based Chemicals During Ceh and Ecf Bleaching

Enzymatic characterization of Chilean native wood-rotting fungi for potential use in the bioremediation of polluted environments with chlorophenols

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