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Screening and molecular identification of biosurfactant/bioemulsifier producing bacteria from crude oil contaminated soils samples

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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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Acknowledgements

This study was partially supported by the Scientific Research Council of Harran University (HUBAP, grant no:19264).

Funding

This study was partially supported by the Scientific Research Council of Harran University (HUBAP, grant no:19264).

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Contributions

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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Correspondence to Ebru Uyar.

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The authors “Ebru Uyar and Tuba Avcı” have approved the manuscript and agreed with the submission of the manuscript. They also declare that the paper titled “Screening and molecular identification of biosurfactant/bioemulsifier producing bacteria from crude oil contaminated soils samples” has not been published or being considered for publication elsewhere.

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The authors declare that they have no conflict of interest.

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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

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