Microbial products (biosurfactant and extracellular chromate reductase) of marine microorganism are the potential agents reduce the oxidative stress induced by toxic heavy metals

The present study demonstrates hexavalent chromium reduction and trivalent chromium tolerance behavior of marine Bacillus sp., MTCC 5514 through its extracellular enzyme reductase and biosurfactants production. The isolate reduces 10–2000 mg/L of hexavalent chromium to trivalent chromium with in 24–...

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Bibliographic Details
Published in:Colloids and surfaces, B, Biointerfaces B, Biointerfaces, 2010-09, Vol.79 (2), p.334-339
Main Authors: Gnanamani, A., Kavitha, V., Radhakrishnan, N., Suseela Rajakumar, G., Sekaran, G., Mandal, A.B.
Format: Article
Language:English
Subjects:
Bacteria - drug effects
Bacteria - enzymology
Bacteria - isolation & purification
Biosurfactants
Chromates
Chromium
Chromium - metabolism
Chromium reductase
Chromium reduction
Extracellular Space - drug effects
Extracellular Space - enzymology
Hexavalent chromium
Marine
Metals, Heavy - toxicity
Microorganisms
Oxidation-Reduction - drug effects
Oxidative Stress - drug effects
Oxidoreductases - metabolism
Reductases
Reduction
Remediation
Seawater - microbiology
Surface-Active Agents - pharmacology
Tolerance
Tolerances
Trivalent chromium
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Summary:The present study demonstrates hexavalent chromium reduction and trivalent chromium tolerance behavior of marine Bacillus sp., MTCC 5514 through its extracellular enzyme reductase and biosurfactants production. The isolate reduces 10–2000 mg/L of hexavalent chromium to trivalent chromium with in 24–96 h respectively and the release of extracellular chromium reductase, found responsible for the reduction. Upon reduction, the concentration of trivalent chromium in the medium found comparatively less. Experimental results reveal, biosurfactants activity found responsible for the less concentration of Cr(III). Hypothetically, trivalent chromium upon formation get entrapped in the micelle of biosurfactants, prevents microbial cells from exposure towards trivalent chromium. Thus, the chosen isolate exhibit tolerance and growth with the increasing concentration of chromium.
ISSN:0927-7765
1873-4367
DOI:10.1016/j.colsurfb.2010.04.007