The role of higher polythionates in the reduction of chromium(VI) by Acidithiobacillus and Thiobacillus cultures

In this paper, we report the chromium(VI) reduction by filtrates of Acidithiobacillus and Thiobacillus cultures. Chromium(VI) reduction by filtrates of A. ferrooxidans cultures under acidic conditions was higher than that observed for A. thiooxidans. However, at pH close to 7, chromium(VI) reduction...

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Bibliographic Details
Published in:Journal of biotechnology 2006-03, Vol.122 (1), p.55-61
Main Authors: Allegretti, P., Furlong, J., Donati, E.
Format: Article
Language:English
Subjects:
Acidithiobacillus
Acidithiobacillus - growth & development
Acidithiobacillus - metabolism
Acidithiobacillus ferrooxidans
Acidithiobacillus thiooxidans
Biodegradation, Environmental
Biological and medical sciences
Biotechnology
Cell Culture Techniques - methods
Chromium
Chromium - metabolism
Fundamental and applied biological sciences. Psychology
Hydrogen-Ion Concentration
Oxidation-Reduction
Polythionates
Reduction
Species Specificity
Thiobacillus
Thiobacillus - growth & development
Thiobacillus - metabolism
Thiobacillus thioparus
Thiosulfates - metabolism
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Summary:In this paper, we report the chromium(VI) reduction by filtrates of Acidithiobacillus and Thiobacillus cultures. Chromium(VI) reduction by filtrates of A. ferrooxidans cultures under acidic conditions was higher than that observed for A. thiooxidans. However, at pH close to 7, chromium(VI) reduction by filtrates of T. thioparus cultures was as high as that by filtrates of A. thiooxidans cultures and much higher than that observed for A. ferrooxidans cultures at the same pH. The capability of these cultures to reduce chromium(VI) was associated specifically with the fraction of cultures (cells, sulphur and associated sulphur compounds) retained by filtration through a 0.45 μm filter. In the fraction that comes from A. thiooxidans culture, polythionates (S x O 6 2−) with 3–7 sulphur atoms were detected and identified (by HPLC with MS as detector). The model of vesicles containing polythionates, sulphur and water agrees with our results.
ISSN:0168-1656
1873-4863
DOI:10.1016/j.jbiotec.2005.08.031