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Isolation and characterization of a molybdenum-reducing and SDS-degrading Klebsiella oxytoca strain Aft-7 and its bioremediation application in the environment


Citation

Masdor, Noor Azlina and Abd Shukor, Mohd Shukri and Khan, Aftab and Halmi, Mohd Izuan Effendi and Sheikh Abdullah, Siti Rozaimah and Shamaan, Nor Aripin and Abd. Shukor, Mohd Yunus (2015) Isolation and characterization of a molybdenum-reducing and SDS-degrading Klebsiella oxytoca strain Aft-7 and its bioremediation application in the environment. Biodiversitas, 16 (2). pp. 238-246. ISSN 1412-033X; ESN: 2085-4722

Abstract

Pollution as a result of anthropogenic activities is a severe global issue. These activities including inappropriate disposal, industrial and prospecting activities and unnecessary use of agricultural chemicals have triggered international initiatives to eliminate these contaminants. In this work we screen the ability of a molybdenum-reducing bacterium isolated from contaminated soil to grow and reduce molybdenum on various detergents. The bacterium was able to grow on SDS as a carbon source although the compound did not support molybdenum reduction. The bacterium reduces molybdate to Mo-blue optimally between pH 5.8 and 6.3 and between 25 and 34°C. Glucose was the best electron donor for supporting molybdate reduction followed by sucrose, D-mannitol, D-sorbitol, lactose, salicin, trehalose, maltose and myo-Inositol in descending order. Other requirements include a phosphate concentration between 5.0 and 7.5 mM and a molybdate concentration between 5 and 20 mM. The absorption spectrum of the Mo-blue produced was similar to previous Mo-reducing bacterium, and closely resembles a reduced phosphomolybdate. Molybdenum reduction was inhibited by mercury (ii), silver (i) and copper (ii) at 2 ppm by 62.1, 33.9 and 33.6%, respectively. Biochemical analysis resulted in a tentative identification of the bacterium as Klebsiella oxytocastrain Aft-7. The ability of this bacterium to detoxify molybdenum and degrade detergent makes this bacterium an important tool for bioremediation.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Biotechnology and Biomolecular Sciences
Publisher: Society for Indonesian Biodiversity
Keywords: Bioremediation; Isolation; Klebsiella oxytoca; Molybdenum; SDS
Depositing User: Nabilah Mustapa
Date Deposited: 03 May 2017 09:21
Last Modified: 03 May 2017 09:21
URI: http://psasir.upm.edu.my/id/eprint/51939
Statistic Details: View Download Statistic

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