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<p>Nanoenzymes have emerged as a powerful alternative to natural enzymes due to their excellent chemical stability and simple synthesis process. In this study, sulfur-doped iron-based nanostructures (FeS<sub>4</sub>-T) were synthesized through a one-step hydrothermal method under mild conditions. FeS<sub>4</sub>-T exhibited strong peroxidase-like activity, and the addition of norfloxacin significantly enhanced the color response of TMB/H<sub>2</sub>O<sub>2</sub>/FeS<sub>4</sub>-T. Thus, a rapid and sensitive method for detecting norfloxacin was developed with a linear range of 0.05–10&#xa0;μmol·L⁻<sup>1</sup> and a detection limit of 2&#xa0;nM. Moreover, various quinolones produced different absorbance changes at 652&#xa0;nm and 370&#xa0;nm, forming a unique dual-wavelength signal. Based on these patterns, a colorimetric array was developed to identify seven quinolones and their mixtures. The sulfur-doping strategy proposed provides a novel approach for the rational design of iron-based nanoenzymes and highlights its significant potential in the environmental monitoring of emerging pollutants.</p> Graphical abstract <p></p>

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Sulfur-doped iron-based nanoenzymes as excellent peroxidase mimics for norfloxacin detection and array-based recognition of quinolone antibiotics

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Yanbin Wang,
  • Liling Wang

摘要

Nanoenzymes have emerged as a powerful alternative to natural enzymes due to their excellent chemical stability and simple synthesis process. In this study, sulfur-doped iron-based nanostructures (FeS4-T) were synthesized through a one-step hydrothermal method under mild conditions. FeS4-T exhibited strong peroxidase-like activity, and the addition of norfloxacin significantly enhanced the color response of TMB/H2O2/FeS4-T. Thus, a rapid and sensitive method for detecting norfloxacin was developed with a linear range of 0.05–10 μmol·L⁻1 and a detection limit of 2 nM. Moreover, various quinolones produced different absorbance changes at 652 nm and 370 nm, forming a unique dual-wavelength signal. Based on these patterns, a colorimetric array was developed to identify seven quinolones and their mixtures. The sulfur-doping strategy proposed provides a novel approach for the rational design of iron-based nanoenzymes and highlights its significant potential in the environmental monitoring of emerging pollutants.

Graphical abstract