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Functional characterization of a biosurfactant-producing thermo-tolerant bacteria isolated from an oil reservoir |
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| Authors: | Wang Jing Ji Guang Tian Jing Zhang Hongdan Dong Hanping and Yu Li |
| Affiliation: | College of Chemical Engineering, China University of Petroleum, Beijing 102249, China;College of Chemical Engineering, China University of Petroleum, Beijing 102249, China;College of Chemical Engineering, China University of Petroleum, Beijing 102249, China;College of Chemical Engineering, China University of Petroleum, Beijing 102249, China;College of Chemical Engineering, China University of Petroleum, Beijing 102249, China;Langfang Branch, Research Institute of Petroleum Exploitation and Development, China National Petroleum Corporation, Hebei 065007, China |
| Abstract: | A Bacillus subtilis strain JA-1 isolated from an oil reservoir was studied. This strain is capable of growth and producing biosurfactant at a temperature of 60 oC. In nutrient medium it produced biosurfactant which reduced the surface tension from 68.2 mN/m to 28.3 mN/m, with the critical micelle concentration (CMC) of 48 mg/L. The measured surface tension indicated that the biosurfactant possessed stable surface activity at high temperature and a specific range of pH and salt concentrations. The results of thin layer chromatography (TLC) together with FT-IR showed that the metabolic product of strain JA-1 is a lipopeptide biosurfactant. The ability to growth at high temperature and to produce biosurfactant makes strain JA-1 promising for enhanced oil recovery. |
| Keywords: | Biosurfactant bacillus subtilis lipopeptide surface tension critical micelle concentration (CMC) |
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