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Biodegradation of a complex hydrocarbon mixture and biosurfactant production by Burkholderia thailandensis E264 and an adapted microbial consortium

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Abstract

Bioremediation is considered to be an effective treatment for hydrocarbon removal from polluted soils. However, the effectiveness of this treatment is often limited by the low availability of targeted contaminants. Biosurfactants produced by some microorganisms can increase organic compound solubility and might then overcome this limitation. Two different inocula producers of biosurfactants (Burkholderia thailandensis E264 and SHEMS1 microbial consortium isolated from a hydrocarbon-contaminated soil) were incubated in Bushnell-Haas medium supplemented with hydrocarbons to investigate their biodegradation potential. Experimental results showed their ability to degrade 9.1 and 6.1% of hydrocarbons respectively after 65 days of incubation with an initial total hydrocarbon concentration of 16 g L−1. The biodegradation was more effective for the light and medium fractions (C10 to C36). B. thailandensis and SHEMS1 consortium produced surfactants after 14 days of culture during the stationary phase with hydrocarbons as the sole carbon and energy source. However, biosurfactant production did not appear to directly increase hydrocarbon degradation efficiency. The complexity and recalcitrance of hydrocarbon mixture used in this study appeared to continue to limit its biodegradation even in the presence of biosurfactants. In conclusion, B. thailandensis and SHEMS1 consortium can degrade recalcitrant hydrocarbon compounds and are therefore good candidates for the bioremediation of environments polluted by total hydrocarbons.

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Acknowledgements

The authors thank Guillaume Hostyn for his assistance with GC-FID analyses. Séverine Bienaimé is gratefully acknowledged for performing the ion chromatography analyses. Thank you to Christophe Barnier for supplying the hydrocarbon mixture.

Funding

This work was supported by project BIO&BIO of The French Agency for Ecological Transition (ADEME, Gesipol call).

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Contributions

ED, SH and SO all contributed to the study conception and design. Material preparation, data collection and analysis were performed by ED. Microbial consortium was isolated by CEM. Metagenomic analysis and bioinformatic treatment were conducted by MD-L. Hydrocarbon analysis were realised by ED and CJ. The first draft of the manuscript was written by ED. SH, MD-L and SO commented on further versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Stéphanie Ouvrard.

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The authors declare no competing interests.

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D’Incau, E., Ouvrard, S., Devers-Lamrani, M. et al. Biodegradation of a complex hydrocarbon mixture and biosurfactant production by Burkholderia thailandensis E264 and an adapted microbial consortium. Biodegradation (2024). https://doi.org/10.1007/s10532-024-10073-6

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  • DOI: https://doi.org/10.1007/s10532-024-10073-6

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