Biosurfactant Production by Bacillus salmalaya for Lubricating Oil Solubilization and Biodegradation

Abstract

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.

Biosorption Potential of Bacillus salmalaya Strain 139SI for Removal of Cr(VI) from Aqueous Solution

“…Bacillus salmalaya 139SI has shown a high potential of remediating hydrocarbons from contaminated soil and water [ 21 , 22 , 23 ]. However, the current study aimed to evaluate the Cr(VI) biosorption potential from the dead and live cells of a novel Bacillus strain isolated from an agricultural soil in Malaysia.…”

Bioremediation of petroleum contaminated soils by lipopeptide producing Bacillus subtilis SE1

“…Many Bacillus strains were also isolated and reported to produce biosurfactant simultaneously with biodegradation of hydrocarbons in used engine oil e.g. B. subtilis CN2 (Bezza and Chirwa, 2015) and Bacillus salmalaya 139SI (Dadrasnia and Ismail, 2015). Differences in PRP values were observed when B. subtilis SE1 bioaugmented in soils contaminated with each type of petrochemicals.…”

Bacterial Biosurfactants - A Boon to Dairy Industry

“…The lowest Surface tension was produced at 20 0 C. Surface tension sharply increased when the temperature increased up to 37 0 C and then gradually decreased and remained constant at 46 0 C. Thus, temperature affects biosurfactant production (Dadrasnia and Ismail, 2015).…”