Bioreduction of hexavalent chromium by <Emphasis Type="Italic">Pseudomonas stutzeri</Emphasis> L1 and <Emphasis Type="Italic">Acinetobacter baumannii</Emphasis> L2 |
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| Authors: | Kuppusamy Sathishkumar Kadarkarai Murugan Giovanni Benelli Akon Higuchi Aruliah Rajasekar |
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| Institution: | 1.Department of Biotechnology, Environmental Molecular Microbiology Research Laboratory,Thiruvalluvar University,Vellore,India;2.Division of Entomology, Department of Zoology, School of Life Sciences,Bharathiar University,Coimbatore,India;3.Thiruvalluvar University,Vellore,India;4.Department of Agriculture, Food and Environment,University of Pisa,Pisa,Italy;5.Department of Chemical and Materials Engineering,National Central University,Taoyuan City,Taiwan (R.O.C.) |
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| Abstract: | Bioreduction of the very toxic hexavalent chromium ion Cr(VI)] to the non-toxic trivalent chromium ion Cr(III)] is a key remediation process in chromium-contaminated sites. In this study, we investigated the bioreduction of Cr(VI) by Pseudomonas stutzeri L1 and Acinetobacter baumannii L2. The optimum pH (5–10), temperature (27, 37 and 60 °C) and initial chromium Cr(VI) concentration (100–1000 mg L?1) for Cr(VI) reduction by strains L1 and L2 were determined using the diphenylcarbazide method. In the presence of L1 and L2, the bioreduction rate of Cr(VI) was 40–97 and 84–99%, respectively. The bioreduction of Cr(VI) by L2 was higher, reaching up to 84%—than that by L1. The results showed that strain L2 was able to survive even if exposed to 1000 mg L?1 of Cr(VI) and that this tolerance to the effects of Cr(VI) was linked to the activity of soluble enzyme fractions. Overall, A. baumannii L2 would appear to be a potent Cr(VI)-tolerant candidate for the bioremediation of chromium (VI)-contaminated wastewater effluent. |
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