Journal
BIORESOURCE TECHNOLOGY
Volume 123, Issue -, Pages 256-262Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.07.056
Keywords
Pseudomonas nitroreducens; Biosurfactant; Bioemulsifier; Bioremediation; Microbial enhanced oil recovery
Funding
- Jawaharlal Nehru Memorial Fund
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Pseudomonas nitroreducens TSB.MJ10 exhibiting growth and bioemulsifier production with 0.5% sodium benzoate as the sole carbon source was isolated from a mangrove ecosystem in the vicinity of a petroleum pump. The bioemulsifier is a lipopeptide that is stable over a pH range of 5-11 and a temperature range of 20-90 degrees C and showed emulsifying activity in the presence of relatively high NaCl concentrations (up to 25%). The bioemulsifier formed stable emulsions with aliphatic (hexadecane, n-heptane, cyclohexane), aromatic (xylene, benzene, toluene) and petroleum (gasoline, diesel, kerosene, crude oil) compounds. It exhibited a maximum emulsification activity with weathered crude oil (97%) and was capable of transforming the rheological behavior of the pseudoplastic to a Newtonian fluid. The results reveal the potential of the bioemulsifier for use in bioremediation of hydrocarbons in marine environments and in enhanced oil recovery. (C) 2012 Elsevier Ltd. All rights reserved.
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