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Performance evaluation of rhamnolipid biosurfactant produced by Pseudomonas aeruginosa and its effect on marine oil-spill remediation

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Abstract

This study aimed to reveal that the effect of biosurfactant on the dispersion and degradation of crude oil. Whole genome analysis showed that Pseudomonas aeruginosa GB-3 contained abundant genes involved in biosurfactant synthesis and metabolic processes and had the potential to degrade oil. The biosurfactant produced by strain GB-3 was screened by various methods. The results showed that the surface tension reduction activity was 28.6 mN·m−1 and emulsification stability was exhibited at different pH, salinity and temperature. The biosurfactant was identified as rhamnolipid by LC–MS and FTIR. The fermentation conditions of strain GB-3 were optimized by response surface methodology, finally the optimal system (carbon source: glucose, nitrogen source: ammonium sulfate, C/N ratio:16:1, pH: 7, temperature: 30–35 °C) was determined. Compared with the initial fermentation, the yield of biosurfactant increased by 4.4 times after optimization. In addition, rhamnolipid biosurfactant as a dispersant could make the dispersion of crude oil reach 38% within seven days, which enhanced the bioavailability of crude oil. As a biostimulant, it could also improve the activity of indigenous microorganism and increase the degradation rate of crude oil by 10–15%. This study suggested that rhamnolipid biosurfactant had application prospect in bioremediation of marine oil-spill.

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Funding

This research was financially supported by the State Key Laboratory of Petroleum Pollution Control (Grant No. PPC2018014).

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Contributions

MZ: conceptualization, methodology, data analysis, writing, software, writing-original draft, visualization and revision of original manuscript; HZ: conceptualization, supervision and review; WC, YS: review and editing; YS, SS, QL: project administration, review and editing; QL: funding acquisition, proposing concepts, data curation; All authors read and contributed the final manuscript.

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Correspondence to Qiyou Liu.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Communicated by Pankaj Bhatt.

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Zhu, M., Zhang, H., Cui, W. et al. Performance evaluation of rhamnolipid biosurfactant produced by Pseudomonas aeruginosa and its effect on marine oil-spill remediation. Arch Microbiol 206, 183 (2024). https://doi.org/10.1007/s00203-024-03903-x

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  • DOI: https://doi.org/10.1007/s00203-024-03903-x

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