Abstract
A total of seventy-one bacteria were isolated from crude oil-contaminated soil samples. The isolates were screened for biosurfactant production by applying various methods, including determination of hemolytic, lipolytic, and esterolytic activities, oil displacement, parafilm M, drop-collapse, CTAB-methylene blue agar tests, determination of emulsification index (E24) and reduction in surface tension. Thirteen isolates were selected and further subjected to molecular identification. 16S rRNA gene sequencing analysis indicated that the isolates belong to Pseudomonas (Pseudomonas sp., P. balearica, and P. aeruginosa), Acinetobacter (A. radioresistens, A. baumanni), Bacillus (Bacillus sp.) and Priestia (Priestia sp.) genera. The largest spreading zone diameter (6.5 cm) and the highest enzymatic activity index (EAI) for lipolytic (5.4) and esterolytic (2.7) activities were demonstrated by P. aeruginosa strain TBA-B58. Surface tension analysis by the Du Noüy tensiometer confirmed that the glycolipid-type biosurfactant obtained from P. aeruginosa strain TBA-B58 achieved the highest reduction in surface tension with a value of 31.5 ± 0.5 mN m−1. Notable E24 values, superior to the synthetic surfactant sodium dodecyl sulfate, were recorded by the cell-free supernatants obtained from A. baumanni TBA-B45 (66%) and TBA-B56 (65%) against toluene and benzene, respectively. Based on the results of the present study, two biosurfactant/bioemulsifier-producing strains belonging to Pseudomonas and Acinetobacter genera demonstrated significant surface and interfacial activities, which might find applications in the bioremediation of crude oil hydrocarbons.
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Data availability
The sequencing data that support the molecular findings of this study are openly available in the NCBI GenBank (https://www.ncbi.nlm.nih.gov/genbank/).
Abbreviations
- EAI:
-
Enzymatic Activity Index
- E24 :
-
Emulsification Index
- GPS:
-
Global Positioning System
- NA:
-
Nutrient Agar
- LB:
-
Luria Bertani
- BPM:
-
Biosurfactant Production Medium
- MSM:
-
Mineral Salt Medium
- CFS:
-
Cell-free Supernatant
- SDS:
-
Sodium Dodecyl Sulfate
- CTAB-MB:
-
Cetyltrimethylammonium Bromide-Methylene Blue
- PCR:
-
Polymerase Chain Reaction
- NCBI:
-
National Center for Biotechnology Information
- bp:
-
Base pair
- ODD:
-
Oil Displacement Diameter
- ODA:
-
Oil Displacement Area
- PAHs:
-
Polycyclic Aromatic Hydrocarbons
- HA:
-
Hemolytic Activity
- LA:
-
Lipolytic Activity
- EA:
-
Esterolytic Activity
- BA:
-
CTAB-MB Agar
- DC:
-
Drop Collapse Assay
- PM:
-
Parafilm M Test
- OD:
-
Oil Displacement Assay
- EF:
-
Emulsion Formation Capacity
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This study was partially supported by the Scientific Research Council of Harran University (HUBAP, grant no:19264).
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This study was partially supported by the Scientific Research Council of Harran University (HUBAP, grant no:19264).
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EU conceived and designed the study, performed the research, analyzed the data, wrote the paper. TA performed the research except for the surface tension measurements. All authors read and approved the final manuscript.
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Uyar, E., Avcı, T. Screening and molecular identification of biosurfactant/bioemulsifier producing bacteria from crude oil contaminated soils samples. Biologia 78, 2179–2193 (2023). https://doi.org/10.1007/s11756-023-01330-9
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DOI: https://doi.org/10.1007/s11756-023-01330-9