期刊
BIORESOURCE TECHNOLOGY
卷 101, 期 7, 页码 2224-2229出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.11.061
关键词
Laccase; Streptomyces cyaneus; Natural mediator; Azo dyes; Toxicity
资金
- Spanish Ministry of Science [CTQ2004-0344/PPQ, CTQ2009-10447/PPQ]
- Autonomous Government of Madrid (PIA)
- University of Alcala (FPI)
The ability of a laccase (EC 1.10.3.2) produced by Streptomyces cyaneus CECT 3335 to decolourise and detoxify azo dyes was assessed. Results showed that a colour loss of 90% was achieved only in the presence of acetosyringone (0.1 mM) acting as a redox mediator for the laccase. Toxicological analysis of the decolourised dyes revealed that there was no direct correlation between decolouration and detoxification; in fact, in the case of the dyes Methyl Orange and Orange II, a significant increase in toxicity was produced after the treatment. In contrast, a significant decrease in toxicity was observed after the decolouration of New Coccine and Chromotrope 2R. Finally, HPLC analysis of the dyes after treatment revealed the complete disappearance of both dyes and mediator and a concomitant appearance of new chromatographic peaks which could be responsible of the residual toxicity detected in some cases. (C) 2009 Elsevier Ltd. All rights reserved.
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