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[Chromates: resistance and detoxification in bacteria]
1Instituto de Investigaciones Químico-Biológicas, Universidad Michoacán, Morelia, México.
Revista Latinoamericana De Microbiologia
|January 1, 1991
Summary
Hexavalent chromium compounds are toxic environmental pollutants. Bacteria that resist and reduce chromium offer a promising solution for bioremediation of contaminated sites.
Area of Science:
- Environmental microbiology
- Toxicology
- Bioremediation
Background:
- Hexavalent chromium (Cr(VI)) compounds, like chromates and dichromates, are highly toxic, mutagenic, and carcinogenic.
- Industrial processes frequently release Cr(VI) into the environment, posing significant ecological and health risks.
Purpose of the Study:
- To investigate bacterial strains with the dual capability of resisting and reducing toxic hexavalent chromium.
- To explore the potential of these bacteria for the decontamination of chromium-polluted environments.
Main Methods:
- Isolation and characterization of bacterial strains from chromium-contaminated environments.
- Assessment of bacterial resistance mechanisms to hexavalent chromium.
- Evaluation of the chromium reduction potential of selected bacterial strains.
Main Results:
- Identification of bacterial strains exhibiting significant resistance to high concentrations of chromates.
- Demonstration of the ability of these strains to reduce toxic Cr(VI) to less toxic trivalent chromium (Cr(III)).
- Confirmation that resistance and reduction capabilities are often plasmid-mediated.
Conclusions:
- Bacterial strains possessing both chromate resistance and reduction capabilities are valuable for bioremediation.
- These bacteria offer a sustainable and environmentally friendly approach to decontaminate industrial wastewater and refuse containing hexavalent chromium.