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Evaluation of Biosurfactant Production Capabilities in Bacterial Strains Isolated from Oil-Contaminated Soil

Jasim Mahdi Abdulwahhab, Al-Kalidy Saad Kadhim Ala Allah, Al Shubaily Iman Ismaeel Jaseem

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 3

9--20

This study aims to investigate the biosurfactant production capabilities of bacterial strains isolated from oil-contaminated soil samples. Employing a comprehensive methodological approach, we collected soil samples from thirty different fuel pumps and conducted an extensive screening of bacterial isolates using various tests such as hemolytic activity, emulsification index, blue agar plate method, and drop collapsing test. The results revealed significant biosurfactant production among certain isolates, specifically highlighting the effectiveness of two particular strains. This paper presents a detailed analysis of these strains, including their optimal growth conditions in terms of pH, temperature, carbon, and nitrogen sources. Our findings indicate a notable potential of these bacterial strains in biosurfactant production, with implications for environmental bioremediation, particularly in oil pollution contexts. The study also sheds light on the limitations encountered and underscores the originality of the research in exploring biosurfactant production in a novel context. This study contributes to the field by offering insights into the effective utilization of microbial strains for biosurfactant synthesis, which is crucial for sustainable and eco-friendly bioremediation practices.

Agroindustrial wastes as unconventional substrates for growing of bacillus strains and production of biosurfactant

Płaza G. A., Pacwa-Płociniczak M., Piotrowska-Seget Z., Jangid K., Wilk K. A.

Environment Protection Engineering

2011

Vol. 37, nr 3

63-71

The study was aimed at the development of economical methods for biosurfactant production by the use of unconventional substrates. The research investigated the potential of utilising agroindustrial wastes to replace synthetic media for cultivation of Bacillus strains and biosurfactant production. In total, 21 of the waste products from dairy, sugar, fatty, and fruit and vegetable processing industries, breweries, distillery were examined. Three bacterial strains were identified by 16S rRNA gene sequencing: Bacillus subtilis (I'-1a), Bacillus sp. (T-1), Bacillus sp. (T'-1). Biosurfactant production was examined in an indirect way by measuring of surface tension (ST), blood agar lysis, oil spreading and drop collapsing tests. The best unconventional substrates for bacteria growing and biosurfactant production at 30 °C under aerobic conditions were molasses, brewery effluents, and fruit and vegetable decoction from the processing factory.