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Hexavalent molybdenum reduction to Mo-Blue by a sodium-dodecyl-sulfate-degrading Klebsiella oxytoca strain DRY14


Halmi, Mohd Izuan Effendi and Saad, Wan Zuhainis and Yusof, Mohd Termizi and Shaharuddin, Noor Azmi and Wasoh @ Mohamad Isa, Helmi and Abd. Shukor, Mohd. Yunus and Syed, Mohd Arif and Ahmad, Siti Aqlima (2013) Hexavalent molybdenum reduction to Mo-Blue by a sodium-dodecyl-sulfate-degrading Klebsiella oxytoca strain DRY14. BioMed Research International, 2013. art. no. 384541. pp. 1-8. ISSN 2314-6133; ESSN: 2314-6141


Bacteria with the ability to tolerate, remove, and/or degrade several xenobiotics simultaneously are urgently needed for remediation of polluted sites. A previously isolated bacterium with sodium dodecyl sulfate- (SDS-) degrading capacity was found to be able to reduce molybdenum to the nontoxic molybdenum blue. The optimal pH, carbon source, molybdate concentration, and temperature supporting molybdate reduction were pH 7.0, glucose at 1.5% (w/v), between 25 and 30 mM, and 25°C, respectively. The optimum phosphate concentration for molybdate reduction was 5 mM. The Mo-blue produced exhibits an absorption spectrum with a maximum peak at 865 nm and a shoulder at 700 nm. None of the respiratory inhibitors tested showed any inhibition to the molybdenum-reducing activity suggesting that the electron transport system of this bacterium is not the site of molybdenum reduction. Chromium, cadmium, silver, copper, mercury, and lead caused approximately 77, 65, 77, 89, 80, and 80% inhibition of the molybdenum-reducing activity, respectively. Ferrous and stannous ions markedly increased the activity of molybdenum-reducing activity in this bacterium. The maximum tolerable concentration of SDS as a cocontaminant was 3 g/L. The characteristics of this bacterium make it a suitable candidate for molybdenum bioremediation of sites cocontaminated with detergent pollutant.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Biotechnology and Biomolecular Sciences
DOI Number: https://doi.org/10.1155/2013/384541
Publisher: Hindawi Publishing Corporation
Keywords: Klebsiella oxytoca; Molybdate-reduction; Mo-blue
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 20 Jun 2016 06:12
Last Modified: 20 Jun 2016 06:12
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1155/2013/384541
URI: http://psasir.upm.edu.my/id/eprint/28091
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