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Immobilization of psychrophile Psychrobacter sp. ANT206 onto novel reusable magnetic nanoparticles and its application for nitro-aromatic compounds biodegradation under low temperature

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Abstract

Efficient biodegradation may offer a solution for the treatment of nitro-aromatic compounds (NACs) with toxicity, mutagenicity and persistence in the environment. In this study, dopamine (DA) functionalized magnetic nanoparticles with biocompatibility and hydrophilicity were synthesized and utilized for the immobilization of nitro-aromatic compounds degrading psychrophile Psychrobacter sp. ANT206 harboring the cold-adapted nitroreductase. The prepared nanocarriers were characterized using multiple methods. The highest immobilization yield of cells immobilized by Fe3O4@SiO2@DA was 90.67% under the optimized conditions of 10 °C, pH 7.5, 2 h and cell/support 1.2 mg/mg, and the activity recovery was 89.41%. In addition, the obtained immobilized cells displayed excellent salinity stability and reusability. Moreover, immobilized P. sp. ANT206 strains showed remarkable biodegradation capability on nitrobenzene and p-nitrophenol. This study introduced those novel Fe3O4@SiO2@DA nanoparticles could be applied as ideal and low-cost nanocarriers for the immobilization of cells and large-scale bioremediation of hazardous NACs with perspective applications under low temperature.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (41876149), and the Natural Science Foundation of Shandong Province, China (ZR2021MD040); School-local Cooperation Talent Funding Program of Weihai, China.

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YW: conceptualization, software, formal analysis, data curation, writing-original draft. YH: methodology, software, funding acquisition. YW: validation, investigation, writing-review & editing. AZ: methodology, formal analysis, data curation. QW: conceptualization, validation, writing-review & editing, supervision, writing-review & editing.

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Correspondence to Quanfu Wang.

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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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Wang, Y., Hou, Y., Wang, Y. et al. Immobilization of psychrophile Psychrobacter sp. ANT206 onto novel reusable magnetic nanoparticles and its application for nitro-aromatic compounds biodegradation under low temperature. Biodegradation 33, 223–237 (2022). https://doi.org/10.1007/s10532-022-09978-x

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  • DOI: https://doi.org/10.1007/s10532-022-09978-x

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