Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Improved Biosurfactant Production by Bacillus subtilis SPB1 Mutant Obtained by Random Mutagenesis and Its Application in Enhanced Oil Recovery in a Sand System

  • Bouassida, Mouna (Unite Enzymes et Bioconversion, Ecole Nationale d'Ingenieurs de Sfax, Universite de Sfax) ;
  • Ghazala, Imen (Laboratoire d'amelioration des plantes et valorisation des agroressources, Ecole Nationale d'Ingenieurs de Sfax, Universite de Sfax) ;
  • Ellouze-Chaabouni, Semia (Unite Enzymes et Bioconversion, Ecole Nationale d'Ingenieurs de Sfax, Universite de Sfax) ;
  • Ghribi, Dhouha (Unite Enzymes et Bioconversion, Ecole Nationale d'Ingenieurs de Sfax, Universite de Sfax)
  • Received : 2016.01.13
  • Accepted : 2017.07.28
  • Published : 2018.01.28
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Abstract

Biosurfactants or microbial surfactants are surface-active biomolecules that are produced by a variety of microorganisms. Biodegradability and low toxicity have led to the intensification of scientific studies on a wide range of industrial applications for biosurfactants in the field of environmental bioremediation as well as the petroleum industry and enhanced oil recovery. However, the major issues in biosurfactant production are high production cost and low yield. Improving the bioindustrial production processes relies on many strategies, such as the use of cheap raw materials, the optimization of medium-culture conditions, and selecting hyperproducing strains. The present work aims to obtain a mutant with higher biosurfactant production through applying mutagenesis on Bacillus subtilis SPB1 using a combination of UV irradiation and nitrous acid treatment. Following mutagenesis and screening on blood agar and subsequent formation of halos, the mutated strains were examined for emulsifying activity of their culture broth. A mutant designated B. subtilis M2 was selected as it produced biosurfactant at twice higher concentration than the parent strain. The potential of this biosurfactant for industrial uses was shown by studying its stability to environmental stresses such as pH and temperature and its applicability in the oil recovery process. It was practically stable at high temperature and at a wide range of pH, and it recovered above 90% of motor oil adsorbed to a sand sample.

Keywords

References

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