期刊
BIODEGRADATION
卷 33, 期 1, 页码 17-31出版社
SPRINGER
DOI: 10.1007/s10532-021-09963-w
关键词
4-Hydroxybenzoic acid; Biodegradation; Anaerobic; Acinetobacter johnsonii; Klebsiella oxytoca; Bioremediation
资金
- National Natural Science Foundation of China [31800327, 32071505, 31570028]
- Anhui University Natural Science Foundation [KJ2020A0084]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
In this study, two bacterial strains, identified as Acinetobacter johnsonii and Klebsiella oxytoca, were isolated from marine sediments and shown to efficiently degrade 4-HBA and other lignin-derived compounds under anaerobic conditions. The immobilization of these strains demonstrated their potential for bioremediation of 4-HBA in aqueous environments. Soils inoculated with the strains showed higher 4-HBA degradation rates, indicating their effectiveness in anaerobic soil. These findings contribute to the development of anaerobic bioremediation systems for 4-HBA.
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 center dot 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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