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Decolorization of Azo, triphenylmethane and anthraquinone dyes by laccase of a newly isolated armillaria SP.F022

Hadibarata, Tony and Mohd. Yusoff, Abdull Rahim and Aris, Azmi and Salmiati, Salmiati and Hidayat, Topik and Kristanti, Risky Ayu (2012) Decolorization of Azo, triphenylmethane and anthraquinone dyes by laccase of a newly isolated armillaria SP.F022. Water, Air, & Soil Pollution, 22 (3). ISSN 0049-6979

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Official URL: http://dx.doi.org/10.1007/s11270-011-0922-6

Abstract

A newly isolated white-rot fungus, Armillaria sp. strain F022, was isolated from the decayed wood in a tropical rain forest. Strain F022 was capable of decolorizing a variety of synthetic dyes, including azo, triphenylmethane, and anthraquinone dyes, with an optimal efficiency of decolorization obtained when dyes added after 96 h of culture, with the exception of Brilliant Green. All of the tested dyes were decolorized by the purified laccase in the absence of any redox mediators, but only a few were completely removed, while others were not completely removed even when decolorization time was increased. The laccase, with possible contributions from unknown enzymes, played a role in the decolorization process carried out by Armillaria sp. F022 cultures, and this biosorption contributed a negligible part to the decolorization by cultures. The effect of dye to fungal growth was also investigated. When dyes were added at 0 h of culture, the maximum dry mycelium weight (DMW) values in the medium containing Brilliant Green were 1/6 of that achieved by the control group. For other dyes, the DMW was similar with control. The toxic tolerance of dye for the cell beads was excellent at least up to a concentration of 500 mg/l. The optimum conditions for decolorization of three synthetic dyes are at pH 4 and 40°C.

Item Type:Article
Uncontrolled Keywords:Water, air and soil pollution
Subjects:T Technology > TD Environmental technology. Sanitary engineering
Divisions:Civil Engineering
ID Code:46771
Deposited By: Haliza Zainal
Deposited On:22 Jun 2015 05:56
Last Modified:19 Sep 2017 04:41

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