Abstract
A newly marine Halomonas pacifica strain Cnaph3 was isolated, as a naphthalene degrader and biosurfactant producer, from contaminated seawater collected in Ataya’s fishing harbor, located in Kerkennah Islands, Tunisia. Chromatography flame ionization detector analysis revealed that 98.8% of naphthalene (200 mg/L) was degraded after 7 days of incubation, at 30 g/L NaCl and 37 °C. Strain Cnaph3 showed also a noticeable capacity to grow on a wide range of aliphatic, aromatic, and complex hydrocarbons. Interestingly, strain Cnaph3 showed a significant potential to produce biosurfactants in the presence of all tested substrates, particularly on glycerol (1%, v/v). Electrospray ionization analysis of the biosurfactant, designated Bios-Cnaph3, suggested a lipopeptide composition. The critical micelle concentration of Bios-Cnaph3 was about 500 mg/L. At this concentration, the surface tension of the water was reduced to 27.6 mN/m. Furthermore, Bios-Cnaph3 displayed interesting stabilities over a wide range of temperatures (4–105 °C), salinities (0–100 g/L NaCl), and pH (2.2–12.5). In addition, it showed promising capacities to remove used motor oil from contaminated soils. The biodegradation and biosurfactant-production potential of the Halomonas sp. strain Cnaph3 would present this strain as a favorite agent for bioremediation of hydrocarbon-contaminated sites under saline conditions.
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Acknowledgements
This research was supported by a grant provided by the Tunisian Ministry of Higher Education and Scientific Research and the Laboratory of Environmental Bioprocesses, Centre of Biotechnology of Sfax, Tunisia. This work was also partially financed by the Ministerio de Economia y Competitividad, Spain. Authors would like to thank Mrs. Fatma Rezgui for her technical assistance in GC–MS analyses, Mr. Nidhal Baccar for his technical assistance in GC-FID and FTIR analyses and Mr. Slim Loukil for his help with chemical analyses. Finally, the authors would like to thank Dr. Ayadi Hajji for proofreading, correcting and improving the English of the manuscript.
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MC performed most of the experiments, data analysis and drafted the manuscript, DH helped in the manuscript interpretation, AC helped in the Phylogenetic analysis, NM performed the molecular analysis, Professor SS assisted with financial support, Professor AMM performed the ESI–MS analysis and Professor MC designed and directed the study.
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Cheffi, M., Hentati, D., Chebbi, A. et al. Isolation and characterization of a newly naphthalene-degrading Halomonas pacifica, strain Cnaph3: biodegradation and biosurfactant production studies. 3 Biotech 10, 89 (2020). https://doi.org/10.1007/s13205-020-2085-x
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DOI: https://doi.org/10.1007/s13205-020-2085-x