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Functional Evaluation and Physicochemical Characterization of a Lipopeptide Biosurfactant Produced by the Stenotrophomonas sp. IE-93

  • Hamid Reza Karbalaei-HeidariEmail author
  • Ladan Taghavi
  • Parvin Hasanizadeh
Research paper
First Online:
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Part of the following topical collections:
  1. Biology

Abstract

In the present work, biosurfactant production of the bacterial strain Stenotrophomonas sp. IE-93 was surveyed and quantified through four conventional screening methods. The biosurfactant produced by the strain IE-93 could reduce the surface tension to 24 mN m−1 and showed 100% emulsification activity when equal volume of n-hexane and fermentation medium was applied. Effects of culture conditions on productivity of the strain revealed that olive oil and ammonium sulfate were the best carbon and nitrogen sources, respectively. The crude produced biosurfactant showed a good stability during exposure to high temperatures (up to 120 °C), high salinity (up to 20% NaCl) and a wide range of pHs (2.0–12.0). Purification of the biosurfactant was performed using ethyl acetate, and crude extract was separated on silica gel column chromatography. The chemical characterization of the purified biosurfactant by FTIR spectroscopy revealed that it has a lipopeptide nature. Moreover, ultraviolet mutation of Stenotrophomonas sp. IE-93 yielded a stable mutant that produced over 1.7-fold more of the biosurfactant than the parent strain. Overall, the results suggest that Stenotrophomonas sp. IE-93 could be suitable candidate to use in various industrial processes needing emulsifier, especially in oil industry which needs a stable surfactant in high temperature and salinity conditions.

Keywords

Biosurfactant Stenotrophomonas Surface activity Stability UV mutagenesis 
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Notes

Acknowledgements

We would like to thank the research affairs of Shiraz University, Shiraz, Iran. This work was supported in part by a grant for Scientific Research from the Iran National Science foundation (INSF) under Contract Number of 93035486.

Supplementary material

40995_2018_656_MOESM1_ESM.docx (144 kb)
Supplementary material 1 (DOCX 143 kb)

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Copyright information

© Shiraz University 2018

Authors and Affiliations

  1. 1.Molecular Biotechnology Laboratory, Department of Biology, Faculty of ScienceShiraz UniversityShirazIran

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