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Enhanced delignification of mixed wood pulp by Aspergillus fumigatus laccase mediator system

World journal of microbiology & biotechnology, 2008-12, Vol.24 (12), p.2799-2804 [Peer Reviewed Journal]

Springer Science+Business Media B.V. 2008 ;2008 INIST-CNRS ;ISSN: 0959-3993 ;EISSN: 1573-0972 ;DOI: 10.1007/s11274-008-9809-0

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Title:
Enhanced delignification of mixed wood pulp by Aspergillus fumigatus laccase mediator system
Author: Vivekanand, V ; Dwivedi, Pallavi ; Sharma, Amit ; Sabharwal, Nidhi ; Singh, Rajesh P
Subjects: Applied Microbiology ; Aspergillus fumigatus ; Biochemistry ; Biological and medical sciences ; Biomedical and Life Sciences ; Biotechnology ; Cellulose ; Environmental Engineering/Biotechnology ; Enzymes ; Fundamental and applied biological sciences. Psychology ; Laboratories ; Life Sciences ; Lignin ; Microbiology ; Original Paper ; Scanning electron microscopy ; Spectrum analysis ; Studies ; Wood composites
Is Part Of: World journal of microbiology & biotechnology, 2008-12, Vol.24 (12), p.2799-2804
Description: An environmentally sound biobleaching to get high quality paper pulp from mixed wood pulp was attempted employing laccase from Aspergillus fumigatus VkJ2.4.5 for lignin removal. Laccase treatment was performed in the presence of a mediator N-hydroxybenzotriazole (HBT, 1.5% w/w), resulting into notably higher level of delignification of the pulp. Enzyme at 10 Ug⁻¹ of pulp at 50°C, pH 6.0, for 2 h with a pulp consistency of 10% was found suitable for enabling maximum decrease in the kappa number. The kappa number and yellowness decreased by 14 and 4% whereas ISO brightness improved by 7%. The presence of a characteristic peak at 280 nm indicated the presence of lignin in the effluent during biobleaching. Analysis of FTIR spectra of residual lignin revealed characteristic modifications following enzymatic bleaching by laccase mediator system (LMS). Variations in morphology and crystallinity of pulp were evaluated by scanning electron microscopy and X-ray diffraction analysis.
Publisher: Dordrecht: Dordrecht : Springer Netherlands
Language: English
Identifier: ISSN: 0959-3993
EISSN: 1573-0972
DOI: 10.1007/s11274-008-9809-0
Source: Alma/SFX Local Collection
ProQuest Central

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Enhanced delignification of mixed wood pulp by Aspergillus fumigatus laccase mediator system

Springer Science+Business Media B.V. 2008 ;2008 INIST-CNRS ;ISSN: 0959-3993 ;EISSN: 1573-0972 ;DOI: 10.1007/s11274-008-9809-0

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