Isolation of a bacterial strain with the ability to utilize the sulfonated azo compound 4-carboxy-4'-sulfoazobenzene as the sole source of carbon and energy

Article Abstract:

The use of the sulfonated azo compound 4-carboxy-4'-sulfoazobenzene (CSAB) as the sole source of carbon and energy by a bacterial strain was described. The bacterial strain S5 was isolated by continuous adaptation of 'Hydrogenophaga palleronii' S1 while the model CSAB was synthesized by nitro-amine condensation. Results showed a reductive cleavage in CSAB with sulfanilate as one of the reduction products. Furthermore, strain S5 displayed the ability to mineralize CSAB, indicating the possibility of degrading sulfonated azo dyes under aerobic conditions.

Physiological aspects, Bacteria, Chemistry, Biomineralization, Dyes and dyeing, Dye chemistry

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Localization of the enzyme system involved in anaerobic reduction of azo dyes by Sphingomonas sp. strain BN6 and effect of artificial redox mediators on the rate of azo dye reduction

Article Abstract:

Microbiological research shows that cytoplasmic and membrane-bound azo reductase activities are involved in the anaerobic reduction of azo dyes by the naphthalene-sulfonate-degrading bacteria Sphingomonas sp. strain BN6. Artificial redox mediators significantly improve reduction rates when sulfonated anthraquinones are present. Evidence suggests that the NADH: ubiquinone oxidoreductase respirator chain enzyme causes azo dye reduction.

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Reduction of azo dyes by redox mediators originating in the naphthalenesulfonic acid degradation pathway of Sphingomonas sp. strain BN6

Article Abstract:

Microbiological research shows that the aerobic 2-naphthalene-sulfonic acid degradation pathway affects the anaerobic reduction of azo dyes bySphingomonas sp. strain BN6 bacteria. Evidence suggests that decomposition products of 1,2-dihydroxynaphthalene serve as redox mediators by moving reduction equivalents from cell to azo dye. Further research is continuing to establish the genetic sequence involved in the reaction.

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