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<p>Adual-response ratiometric fluorescent probe based on Tb<sup>3+</sup>- and Eu<sup>3+</sup>-codoped metal-organic framework (MOF) membrane on silica microspheres (denoted as SiO<sub>2</sub>@(Tb: Eu)–BPDC) was fabricated. Benefiting from the orientation growth of Tb<sup>3+</sup>/Eu<sup>3+</sup>-MOF around the silica microspheres to achieve a uniform thin film with a thickness of 5–8&#xa0;nm, the dual-channel transient ratiometric fluorescences are obtained. The responses are exhibited as an “on-off” mode for CFM (E<sub>x</sub> = 322&#xa0;nm, F<sub>615</sub>/F<sub>544</sub>) via a photoinduced electron transfer (PET) process, and an “off-on” response for tetracycline (TC) or cefixime (CFM) (E<sub>x</sub> = 406&#xa0;nm, F<sub>617</sub>/F<sub>592</sub>) through a target-sensitized “antenna effect”. The established linear correlations demonstrated high sensitivity for CFM with a limit of detection (LOD) of 4 ng mL<sup>− 1</sup> and 24 ng mL<sup>− 1</sup> for TC. Both CFM and TC showed satisfactory spiked recoveries of 91‒114% in herbal tea beverage and milk samples, with relative standard deviations (RSDs) below 3.5%. Subsequently, an intelligent detection platform integrating a smartphone and the probe is developed, enabling qualitative and quantitative analysis for the target antibiotics by color gradient recognition. The research presents a sensitive and accurate sensing platform for in situ and visual monitoring of antibiotics by using the dual-mode sensing to eliminate cross-interference among different analytes.</p> Graphical abstract <p></p>

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A dual-response ratiometric fluorescent probe based on Tb3+/Eu3+-functionalized MOF-membrane on silica microspheres: highly selective detection of cefixime and tetracyclines via a built-in self-calibration strategy

  • 期刊论文

  • 发表日期：

    2026年7月15日

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  • Junlong Li,
  • Zerong Long,
  • Xiaofei Li,
  • Jianling Wang,
  • Tianli Fan,
  • Kai Wang

摘要

Adual-response ratiometric fluorescent probe based on Tb3+- and Eu3+-codoped metal-organic framework (MOF) membrane on silica microspheres (denoted as SiO2@(Tb: Eu)–BPDC) was fabricated. Benefiting from the orientation growth of Tb3+/Eu3+-MOF around the silica microspheres to achieve a uniform thin film with a thickness of 5–8 nm, the dual-channel transient ratiometric fluorescences are obtained. The responses are exhibited as an “on-off” mode for CFM (Ex = 322 nm, F615/F544) via a photoinduced electron transfer (PET) process, and an “off-on” response for tetracycline (TC) or cefixime (CFM) (Ex = 406 nm, F617/F592) through a target-sensitized “antenna effect”. The established linear correlations demonstrated high sensitivity for CFM with a limit of detection (LOD) of 4 ng mL− 1 and 24 ng mL− 1 for TC. Both CFM and TC showed satisfactory spiked recoveries of 91‒114% in herbal tea beverage and milk samples, with relative standard deviations (RSDs) below 3.5%. Subsequently, an intelligent detection platform integrating a smartphone and the probe is developed, enabling qualitative and quantitative analysis for the target antibiotics by color gradient recognition. The research presents a sensitive and accurate sensing platform for in situ and visual monitoring of antibiotics by using the dual-mode sensing to eliminate cross-interference among different analytes.

Graphical abstract