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Biodegradation of 4-hydroxybenzoic acid by Acinetobacter johnsonii FZ-5 and Klebsiella oxytoca FZ-8 under anaerobic conditions

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Abstract

4-Hydroxybenzoic acid (4-HBA) is a common organic compound that is prevalent in the environment, and the persistence of 4-HBA residues results in exertion of pollution-related detrimental effects. Bioremediation is an effective method for the removal of 4-HBA from the environment. In this study, two bacterial strains FZ-5 and FZ-8 capable of utilizing 4-HBA as the sole carbon and energy source under anaerobic conditions were isolated from marine sediment samples. Phylogenetic analysis identified the two strains FZ-5 and FZ-8 as Acinetobacter johnsonii and Klebsiella oxytoca, respectively. The strains FZ-5 and FZ-8 degraded 2000 mg·L−1 4-HBA in 72 h with degradation rates of 71.04% and 80.10%, respectively. The optimum culture conditions for degradation by the strains and crude enzymes were also investigated. The strains FZ-5 and FZ-8 also exhibited the ability to degrade other lignin-derived compounds, such as protocatechuic acid, cinnamic acid, and vanillic acid. Immobilization of the two strains showed that they could be used for the bioremediation of 4-HBA in an aqueous environment. Soils inoculated with the strains FZ-5 and FZ-8 showed higher degradation of 4-HBA than the uninoculated soil, and the strains could survive efficiently in anaerobic soil. This is the first report of 4-HBA-degrading bacteria, belonging to the two genera, which showed degradation ability under anaerobic conditions. This study expound the strains could efficiently degrade 4-HBA in anaerobic soil and will help in the development of 4-HBA anaerobic bioremediation systems.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (31800327, 32071505, 31570028), Anhui University Natural Science Foundation (KJ2020A0084) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

Funding

This study was funded by National Natural Science Foundation of China (31800327, 32071505, 31570028), Anhui University Natural Science Foundation (KJ2020A0084), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Correspondence to Bo Yuan or Zhaozhong Feng.

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Lu, P., Huang, H., Sun, Y. et al. Biodegradation of 4-hydroxybenzoic acid by Acinetobacter johnsonii FZ-5 and Klebsiella oxytoca FZ-8 under anaerobic conditions. Biodegradation 33, 17–31 (2022). https://doi.org/10.1007/s10532-021-09963-w

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  • DOI: https://doi.org/10.1007/s10532-021-09963-w

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