Decolorization of sulfonated azo dyes with two photosynthetic bacterial strains and a genetically engineered Escherichia coli strain

Sulfonated azo dyes were decolorized by two wild type photosynthetic bacterial (PSB) strains (Rhodobacter sphaeroides AS1.1737 and Rhodopseudomonas palustris AS1.2352) and a recombinant strain (Escherichia coli YB). The effects of environmental factors (dissolved oxygen, pH and temperature) on decol...

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Bibliographic Details
Published in:World journal of microbiology & biotechnology 2007-07, Vol.23 (7), p.931-937
Main Authors: LIU, Guang-Fei, ZHOU, Ji-Ti, QU, Yuan-Yuan, XIN MA
Format: Article
Language:English
Subjects:
Azo dyes
Azoreductase
Bacteria
Biological and medical sciences
Biotechnology
Decoloring
Decolorization
Dissolved oxygen
Dyes
E coli
Environmental effects
Environmental factors
Escherichia coli
Fundamental and applied biological sciences. Psychology
Genetic engineering
Microbiology
Photosynthesis
Rhodobacter sphaeroides
Rhodopseudomonas palustris
Strains (organisms)
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Summary:Sulfonated azo dyes were decolorized by two wild type photosynthetic bacterial (PSB) strains (Rhodobacter sphaeroides AS1.1737 and Rhodopseudomonas palustris AS1.2352) and a recombinant strain (Escherichia coli YB). The effects of environmental factors (dissolved oxygen, pH and temperature) on decolorization were investigated. All the strains could decolorize azo dye up to 900 mg l−1, and the correlations between the specific decolorization rate and dye concentration could be described by Michaelis–Menten kinetics. Repeated batch operations were performed to study the persistence and stability of bacterial decolorization. Mixed azo dyes were also decolorized by the two PSB strains. Azoreductase was overexpressed in E. coli YB; however, the two PSB strains were better decolorizers for sulfonated azo dyes.
ISSN:0959-3993
1573-0972
DOI:10.1007/s11274-006-9316-0