Metal transformation as a strategy for bacterial detoxification of heavy metals
| Autor: | Ashraf M. M. Essa, Sayeed I Khatib, Mohamed A. Al Abboud |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Staphylococcus aureus Metal ions in aqueous solution Hydrogen sulfide 030106 microbiology chemistry.chemical_element Metal toxicity Microbial Sensitivity Tests Applied Microbiology and Biotechnology Oxygen Metal 03 medical and health sciences Ammonia chemistry.chemical_compound Bioreactors Metals Heavy Escherichia coli Chelating Agents Bacteria Water General Medicine Mercury Sulfur 030104 developmental biology chemistry visual_art Environmental chemistry visual_art.visual_art_medium Volatilization Carbon |
| Zdroj: | Journal of basic microbiology. 58(1) |
| ISSN: | 1521-4028 |
| Popis: | Microorganisms can modify the chemical and physical characters of metals leading to an alteration in their speciation, mobility, and toxicity. Aqueous heavy metals solutions (Hg, Cd, Pb, Ag, Cu, and Zn) were treated with the volatile metabolic products (VMPs) of Escherichia coli Z3 for 24 h using aerobic bioreactor. The effect of the metals treated with VMPs in comparison to the untreated metals on the growth of E. coli S1 and Staphylococcus aureus S2 (local isolates) was examined. Moreover, the toxic properties of the treated and untreated metals were monitored using minimum inhibitory concentration assay. A marked reduction of the treated metals toxicity was recorded in comparison to the untreated metals. Scanning electron microscopy and energy dispersive X-ray analysis revealed the formation of metal particles in the treated metal solutions. In addition to heavy metals at variable ratios, these particles consisted of carbon, oxygen, sulfur, nitrogen elements. The inhibition of metal toxicity was attributed to the existence of ammonia, hydrogen sulfide, and carbon dioxide in the VMPs of E. coli Z3 culture that might responsible for the transformation of soluble metal ions into metal complexes. This study clarified the capability of E. coli Z3 for indirect detoxification of heavy metals via the immobilization of metal ions into biologically unavailable species. |
| Databáze: | OpenAIRE |
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