Hydrocarbon biodegradation by strain BSP4 isolated from a wastewater treatment plant: insights into rhamnolipid production and characterization

The present study aims to assess the environmental application potential of a rhamnolipid-producing strain, designated BSP4, from a wastewater treatment plant. BSP4 was identified with a high similarity of 99.74% by 16S rRNA sequencing as P . aeruginosa . It showed a significant potential to produce...

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Vydáno v:	International journal of environmental science and technology (Tehran) Ročník 22; číslo 12; s. 11903 - 11918
Hlavní autoři:	Berkat, S., Meliani, A., Cheffi, M., Bouassida, M., Aliane, S., Mazari, H. E., Nair, S., Meziane, M., Sayadi, S., Chamkha, M.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Berlin/Heidelberg Springer Berlin Heidelberg 01.08.2025
Témata:	alkanes antimicrobial properties Aquatic Pollution biodegradation bioremediation biosurfactants Earth and Environmental Science Ecotoxicology Environment Environmental Chemistry Environmental Science and Engineering micelles naphthalene oils Original Paper petroleum polluted soils rhamnolipids salinity Soil Science & Conservation surface tension temperature Waste Water Technology wastewater treatment Water Management Water Pollution Control Biosurfactant Biodegradation Hydrocarbons Antimicrobial activity Rhamnolipid
ISSN:	1735-1472, 1735-2630
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Abstract	The present study aims to assess the environmental application potential of a rhamnolipid-producing strain, designated BSP4, from a wastewater treatment plant. BSP4 was identified with a high similarity of 99.74% by 16S rRNA sequencing as P . aeruginosa . It showed a significant potential to produce biosurfactant, namely Rhl-BSP4, on used frying oil (1%, v/v) as a low-cost substrate, yielding approximately 5.09 ± 0.91 g l −1 after 48 h of incubation. Rhl-BSP4 was capable of reducing the surface tension of water from 72 to 32 mN m ‒1 at the critical micelle concentration of 350 mg l −1 . Additionally, the performance of Rhl-BSP4 was evaluated through qualitative and quantitative tests. In fact, its stability was noted against a wide range of temperature (− 80 to 120 °C), salinity (2–12% NaCl), and pH (2–12). FTIR and NMR analyses suggested the rhamnolipid nature of the produced biosurfactant. Based on GC‒MS analyses, BSP4 degraded 97% of naphthalene (200 mg l −1 ) after seven days of incubation, with notable biodegradation of 4.82% to 83.91% of the main n -alkanes in crude oil (1%, v/v) after 21 days. Moreover, Rhl-BSP4 was more effective than the tested chemical surfactant in removing hydrocarbons from polluted soil. It also displayed promising antimicrobial activity against pathogenic strains, with minimum inhibitory concentrations ranging from 1.562 to 12.5 mg ml −1 . The results indicate that strain BSP4 is a promising hydrocarbon-degrader and rhamnolipid-producer. The efficiency of the produced biosurfactant makes it suitable for use in a range of bioremediation strategies.
AbstractList	The present study aims to assess the environmental application potential of a rhamnolipid-producing strain, designated BSP4, from a wastewater treatment plant. BSP4 was identified with a high similarity of 99.74% by 16S rRNA sequencing as P . aeruginosa . It showed a significant potential to produce biosurfactant, namely Rhl-BSP4, on used frying oil (1%, v/v) as a low-cost substrate, yielding approximately 5.09 ± 0.91 g l −1 after 48 h of incubation. Rhl-BSP4 was capable of reducing the surface tension of water from 72 to 32 mN m ‒1 at the critical micelle concentration of 350 mg l −1 . Additionally, the performance of Rhl-BSP4 was evaluated through qualitative and quantitative tests. In fact, its stability was noted against a wide range of temperature (− 80 to 120 °C), salinity (2–12% NaCl), and pH (2–12). FTIR and NMR analyses suggested the rhamnolipid nature of the produced biosurfactant. Based on GC‒MS analyses, BSP4 degraded 97% of naphthalene (200 mg l −1 ) after seven days of incubation, with notable biodegradation of 4.82% to 83.91% of the main n -alkanes in crude oil (1%, v/v) after 21 days. Moreover, Rhl-BSP4 was more effective than the tested chemical surfactant in removing hydrocarbons from polluted soil. It also displayed promising antimicrobial activity against pathogenic strains, with minimum inhibitory concentrations ranging from 1.562 to 12.5 mg ml −1 . The results indicate that strain BSP4 is a promising hydrocarbon-degrader and rhamnolipid-producer. The efficiency of the produced biosurfactant makes it suitable for use in a range of bioremediation strategies. The present study aims to assess the environmental application potential of a rhamnolipid-producing strain, designated BSP4, from a wastewater treatment plant. BSP4 was identified with a high similarity of 99.74% by 16S rRNA sequencing as P. aeruginosa. It showed a significant potential to produce biosurfactant, namely Rhl-BSP4, on used frying oil (1%, v/v) as a low-cost substrate, yielding approximately 5.09 ± 0.91 g l⁻¹ after 48 h of incubation. Rhl-BSP4 was capable of reducing the surface tension of water from 72 to 32 mN m‒¹ at the critical micelle concentration of 350 mg l⁻¹. Additionally, the performance of Rhl-BSP4 was evaluated through qualitative and quantitative tests. In fact, its stability was noted against a wide range of temperature (− 80 to 120 °C), salinity (2–12% NaCl), and pH (2–12). FTIR and NMR analyses suggested the rhamnolipid nature of the produced biosurfactant. Based on GC‒MS analyses, BSP4 degraded 97% of naphthalene (200 mg l⁻¹) after seven days of incubation, with notable biodegradation of 4.82% to 83.91% of the main n-alkanes in crude oil (1%, v/v) after 21 days. Moreover, Rhl-BSP4 was more effective than the tested chemical surfactant in removing hydrocarbons from polluted soil. It also displayed promising antimicrobial activity against pathogenic strains, with minimum inhibitory concentrations ranging from 1.562 to 12.5 mg ml⁻¹. The results indicate that strain BSP4 is a promising hydrocarbon-degrader and rhamnolipid-producer. The efficiency of the produced biosurfactant makes it suitable for use in a range of bioremediation strategies.
Author	Berkat, S. Meliani, A. Sayadi, S. Nair, S. Chamkha, M. Meziane, M. Bouassida, M. Mazari, H. E. Cheffi, M. Aliane, S.
Author_xml	– sequence: 1 givenname: S. orcidid: 0000-0002-5322-7386 surname: Berkat fullname: Berkat, S. email: samir.berkat@univ-mascara.dz organization: Research Laboratory in Geo-Environment and Spaces Development, Faculty of Natural and Life Sciences, Mustapha Stambouli University – sequence: 2 givenname: A. surname: Meliani fullname: Meliani, A. organization: Research Laboratory in Geo-Environment and Spaces Development, Faculty of Natural and Life Sciences, Mustapha Stambouli University – sequence: 3 givenname: M. surname: Cheffi fullname: Cheffi, M. organization: Laboratory of Environmental Bioprocesses, Centre of Biotechnology of Sfax, University of Sfax – sequence: 4 givenname: M. surname: Bouassida fullname: Bouassida, M. organization: Laboratory of Environmental Bioprocesses, Centre of Biotechnology of Sfax, University of Sfax – sequence: 5 givenname: S. surname: Aliane fullname: Aliane, S. organization: Research Laboratory in Geo-Environment and Spaces Development, Faculty of Natural and Life Sciences, Mustapha Stambouli University – sequence: 6 givenname: H. E. surname: Mazari fullname: Mazari, H. E. organization: Research Laboratory in Geo-Environment and Spaces Development, Faculty of Natural and Life Sciences, Mustapha Stambouli University – sequence: 7 givenname: S. surname: Nair fullname: Nair, S. organization: Research Laboratory in Geo-Environment and Spaces Development, Faculty of Natural and Life Sciences, Mustapha Stambouli University – sequence: 8 givenname: M. surname: Meziane fullname: Meziane, M. organization: Laboratory of Locales Naturals Bioresources, Faculty of Life and Nature Sciences, University of Hassiba Benbouali – sequence: 9 givenname: S. surname: Sayadi fullname: Sayadi, S. organization: Center for Sustainable Development, College of Arts and Sciences, Qatar University – sequence: 10 givenname: M. surname: Chamkha fullname: Chamkha, M. organization: Laboratory of Environmental Bioprocesses, Centre of Biotechnology of Sfax, University of Sfax
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Snippet	The present study aims to assess the environmental application potential of a rhamnolipid-producing strain, designated BSP4, from a wastewater treatment plant....
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SubjectTerms	alkanes antimicrobial properties Aquatic Pollution biodegradation bioremediation biosurfactants Earth and Environmental Science Ecotoxicology Environment Environmental Chemistry Environmental Science and Engineering micelles naphthalene oils Original Paper petroleum polluted soils rhamnolipids salinity Soil Science & Conservation surface tension temperature Waste Water Technology wastewater treatment Water Management Water Pollution Control
Title	Hydrocarbon biodegradation by strain BSP4 isolated from a wastewater treatment plant: insights into rhamnolipid production and characterization
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