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Laccase-loaded magnetic dialdehyde inulin nanoparticles as an efficient heterogeneous natural polymer-based biocatalyst for removal and detoxification of ofloxacin

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Abstract

An efficient heterogeneous natural polymer-based biocatalyst was fabricated through the immobilization of laccase onto dialdehyde inulin (DAI)-coated silica-caped magnetic nanoparticles (laccase@DAI@SiO2@Fe3O4⋅MNPs). The carrier was developed using SiO2@Fe3O4⋅MNPs and functionalized with DAI. The construction of immobilized laccase was confirmed by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Immobilization yield and efficiency were calculated as 61.0 ± 0.3% and 93.0 ± 0.6%, respectively. The immobilized laccase maintained 50% and 85% of its relative activity after 25 repeated cycles and 20 days of storage at 4 °C, respectively. The prepared biocatalyst effectively eliminated ofloxacin, a fluoroquinolone-type antibiotic, with a 63% removal capacity. Besides, antimicrobial activity study on some soil microorganisms involved in the biodegradation of xenobiotics revealed that the laccase-treated ofloxacin resulted in less toxic metabolites. The obtained data indicated that the fabricated biocatalyst is promising for the removal of ofloxacin or other analogs of fluoroquinolones in the environment.

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Acknowledgements

This work was financially supported by the Grant No. 1400-1-151-52987 from Biotechnology Research Center, Tehran University of Medical Sciences, Tehran, Iran to M.A.F.

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MS: Conceptualization, Methodology, Investigation, and Writing—Original Draft. SM: Data curation, Writing- Original draft preparation, Visualization, and Software. HJ-N: Formal analysis, Writing—Review & Editing, and Conceptualization. KV: Visualization, Investigation, and Methodology. SG: Formal analysis, Investigation, and Methodology. HJ: Software, Validation, and Investigation. MAF: Supervision, Conceptualization, Methodology, Resources, Data Curation, Writing—Review & Editing, Project administration, and Funding acquisition

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Correspondence to Mohammad Ali Faramarzi.

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Shokri, M., Mojtabavi, S., Jafari-Nodoushan, H. et al. Laccase-loaded magnetic dialdehyde inulin nanoparticles as an efficient heterogeneous natural polymer-based biocatalyst for removal and detoxification of ofloxacin. Biodegradation 33, 489–508 (2022). https://doi.org/10.1007/s10532-022-09994-x

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  • DOI: https://doi.org/10.1007/s10532-022-09994-x

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