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Characteristics of Biosurfactant Producing Pseudomonas sp. G314  

Shim, So-Hee (Depart. of Biotechnology, Hannam University)
Park, Kyeong-Ryang (Depart. of Biotechnology, Hannam University)
Publication Information
Korean Journal of Microbiology / v.42, no.4, 2006 , pp. 286-293 More about this Journal
Abstract
Three hundred thirty two bacterial colonies which were able to degrade crude oil were isolated from soil samples that were contaminated with oil in Daejon area. Among them, one bacterial strain was selected for this study based on its low surface tension ability, and this selected bacterial strain was identified as Pseudomonas sp. G314 through physiological-biochemical tests and analysis of its 16S rRNA sequence. Pseudomonas sp. G314 showed a high resistance to antibiotics such as ampicillin, chloramphenicol, spectinomycin, and streptomycin, and heavy metals such as Li, Cr, and Mn. It was found that the optimal pH and temperature for biosurfactant production of Pseudomonas sp. G314 were pH 7.0 and $30^{\circ}C$, respectively. After seven hours of inoculated, the biosurfactant activity reached the maximum, and surface tension of the culture broth was decreased from 72 to 25 dyne/cm. The crude biosurfactant was obtained from the culture broth by acid precipitation, followed by solvent extraction, evaporation and then freeze drying. The CMC (critical micelle concentration) value of the crude biosurfactant was 20 mg/L.
Keywords
biosurfactant; critical micelle concentration(CMC); Pseudomonas sp. G314; surface tension;
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