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Int. J. Environ. Res. Public Health 2015, 12(8), 9848-9863; doi:10.3390/ijerph120809848

Biosurfactant Production by Bacillus salmalaya for Lubricating Oil Solubilization and Biodegradation

Department of Biohealth Science, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
Author to whom correspondence should be addressed.
Academic Editors: Rao Bhamidiammarri and Kiran Tota-Maharaj
Received: 24 June 2015 / Revised: 19 July 2015 / Accepted: 27 July 2015 / Published: 19 August 2015
(This article belongs to the Special Issue Environmental Systems Engineering)
View Full-Text   |   Download PDF [2017 KB, uploaded 19 August 2015]   |  


This study investigated the capability of a biosurfactant produced by a novel strain of Bacillus salmalaya to enhance the biodegradation rates and bioavailability of organic contaminants. The biosurfactant produced by cultured strain 139SI showed high physicochemical properties and surface activity in the selected medium. The biosurfactant exhibited a high emulsification index and a positive result in the drop collapse test, with the results demonstrating the wetting activity of the biosurfactant and its potential to produce surface-active molecules. Strain 139SI can significantly reduce the surface tension (ST) from 70.5 to 27 mN/m, with a critical micelle concentration of 0.4%. Moreover, lubricating oil at 2% (v/v) was degraded on Day 20 (71.5). Furthermore, the biosurfactant demonstrated high stability at different ranges of salinity, pH, and temperature. Overall, the results indicated the potential use of B. salmalaya 139SI in environmental remediation processes. View Full-Text
Keywords: biosurfactant; bioremediation; lubricating oil; solubilization activity biosurfactant; bioremediation; lubricating oil; solubilization activity

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Dadrasnia, A.; Ismail, S. Biosurfactant Production by Bacillus salmalaya for Lubricating Oil Solubilization and Biodegradation. Int. J. Environ. Res. Public Health 2015, 12, 9848-9863.

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