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JSIR Vol.66(08) [August 2007] >


Title: Decolorization and detoxification of textile dyes and black liquor by laccase of Cyathus bulleri
Authors: Salony
Mishra, S
Keywords: Black liquor
Color removal
Cyathus bulleri
Laccase
Textile dyes
Issue Date: Aug-2007
Publisher: CSIR
Abstract: A number of direct, vat, basic and other (Ranomill yellow and Texacid fast red A) dyes have been decolorized using concentrated culture filtrate and purified laccase of white-rot fungus Cyathus bulleri. Decolorization (>50%) was achieved in 2-9 days using culture filtrate and this time was significantly reduced with purified laccase of high specific activity (4022 U/mg protein). Addition of ABTS {2, 2’-azinobis (3-ethylthiazoline-6-sulfonate)}, a known mediator of laccase, resulted in further reduction of time to a few hours with decolorization rates from 260 mg l-1 day-1 to 665 mg l-1 day-1. Spectral analysis indicated decrease in dye concentration with no accumulation of light absorbing aromatic materials. Decolorization was accompanied by detoxification, as shown in growth inhibition experiments with Bacillus subtilis. Addition of fungal mycelium to suitably diluted black liquor resulted in significant (60-80%) reduction in color in 3-4 days indicating suitability of this fungus for treatment of paper mill wastes.
Page(s): 684-688
ISSN: 0022-4456
Source:JSIR Vol.66(08) [August 2007]

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