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<p> A&#xa0;novel dual-mode colorimetric and photothermal sensing platform for glyphosate (GLP) based on iron-ferrocenedicarboxylic metal–organic framework (Fe-FcMOF) nanozyme-mediated catalysis&#xa0;is presented. Specifically, the synthesized Fe-FcMOF nanozyme exhibits superior peroxidase (POD)-like activity, which can oxidize colorless 3,3',5,5'-tetramethylbenzidine (TMB) into blue oxidized TMB (ox TMB) in the presence of H<sub>2</sub>O<sub>2</sub>. Due to the photothermal effect of oxTMB, the catalytic system composed of Fe-FcMOF, H<sub>2</sub>O<sub>2</sub> and TMB exhibits remarkable temperature changes (ΔT) before and after being irradiated by near-infrared light at 808&#xa0;nm. Subsequently, Fe-FcMOF reacts with GLP through electrostatic attraction, hydrogen bonding and specific chemical coordination between the -FeO of Fe-FcMOF and -PO<sub>3</sub>H<sub>2</sub> of GLP, resulting in the formation of stable Fe-O-P coordination bonds. This specific interaction leads to the decrease of the POD-like activity of Fe-FcMOF and the ultraviolet absorbance and ΔT of the system. Building upon these findings, we develop a colorimetric and photothermal dual-modal sensor, with detection limits of 0.0676&#xa0;µg&#xa0;mL<sup>−1</sup> and 0.0856&#xa0;µg&#xa0;mL<sup>−1</sup> respectively. Notably, the proposed dual-mode sensing platform enhances the reliability of the assay, which offers a potential approach for the on-site visual detection of pesticide residues to guarantee food safety.</p> Graphical Abstract <p></p>

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Iron-ferrocenedicarboxylic nanozyme based colorimetric and photothermal dual-modal signal catalytic inhibition for detection of glyphosate

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Fuyu Zhang,
  • Yingying Wang,
  • Xueli Luo,
  • Yifan Zhang,
  • Mengyang Li,
  • Xuewei Yang,
  • Haojie Zhao,
  • Wenzhi Tang,
  • Jihong Huang,
  • Zhonghong Li

摘要

A novel dual-mode colorimetric and photothermal sensing platform for glyphosate (GLP) based on iron-ferrocenedicarboxylic metal–organic framework (Fe-FcMOF) nanozyme-mediated catalysis is presented. Specifically, the synthesized Fe-FcMOF nanozyme exhibits superior peroxidase (POD)-like activity, which can oxidize colorless 3,3',5,5'-tetramethylbenzidine (TMB) into blue oxidized TMB (ox TMB) in the presence of H2O2. Due to the photothermal effect of oxTMB, the catalytic system composed of Fe-FcMOF, H2O2 and TMB exhibits remarkable temperature changes (ΔT) before and after being irradiated by near-infrared light at 808 nm. Subsequently, Fe-FcMOF reacts with GLP through electrostatic attraction, hydrogen bonding and specific chemical coordination between the -FeO of Fe-FcMOF and -PO3H2 of GLP, resulting in the formation of stable Fe-O-P coordination bonds. This specific interaction leads to the decrease of the POD-like activity of Fe-FcMOF and the ultraviolet absorbance and ΔT of the system. Building upon these findings, we develop a colorimetric and photothermal dual-modal sensor, with detection limits of 0.0676 µg mL−1 and 0.0856 µg mL−1 respectively. Notably, the proposed dual-mode sensing platform enhances the reliability of the assay, which offers a potential approach for the on-site visual detection of pesticide residues to guarantee food safety.

Graphical Abstract