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The Characterization of Biosurfactant Production Related to Energy Consumption of Biodesulfurization in Pseudomonas aeruginosa ATCC9027

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Pseudomonas aeruginosa ATCC9027 is an engineered strain in Iran to reduce the energy consumption in biodesulfurization, which is capable of producing the rhamnolipid biosurfactant. The biochemical analyses demonstrated that this strain reduced surface tension from 70 to 28 mN/m and emulsified hexadecane by 60%. The highest biosurfactant production was achieved when the cells were grown in minimal salt medium containing 1% (v/v) olive oil and 0.1% (w/v) yeast extract and in the presence of Isoleusin amino acid, Mg2+ (4 mg/l) and Fe2+ (0.8 g/l). Fourier transform infrared spectroscopy indicated the presence of carboxyl, amine, hydroxyl, and methoxyl groups in the extracted biosurfactant. Finally the rhlA and rhlB genes of P. aeruginosa ATCC9027 were sequenced and were highly similar to those of other strains of P. aeruginosa.
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Keywords: biosurfactant; carboxyl; methoxyl; rhlA gene; rhlB gene

Document Type: Research Article

Affiliations: National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran

Publication date: June 8, 2012

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