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<p> A dual-emission, ratiometric fluorescence sensor is reported based on a europium(III)-doped metal-organic framework (Eu/DUT-52) that exhibits blue emission from DUT-52 and red emission from Eu³⁺. Notably, we fond that aflatoxin B1 (AFB1) enhances the fluorescence intensity of DUT-52, whereas the Eu³⁺ emission remains essentially unchanged, enabling ratiometric detection with a concentration-dependent color change from pink to purple. We further investigated the origin of this fluorescence enhancement. The ratiometric response provides a detection limit of 3.9 ng mL⁻¹. For field deployment, Eu/DUT-52 was embedded in a hydrogel to form a simple assay kit, and AFB1 was quantified by smartphone-based RGB analysis of fluorescence images, enabling instrument-free readout with a detection limit of 0.04&#xa0;µg mL⁻¹. The hydrogel sensor shows good selectivity against other mycotoxins and common metal ions with recoveries of 80.59–111.7% in real samples. This work provides a low-cost, recognition-element-free platform for rapid, on-site screening of AFB1.</p> Graphical abstract <p></p>

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Smartphone-assisted ratiometric fluorescence sensing platform using Eu/DUT-52 hydrogel for on-site detection of aflatoxin B1

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Xiaohui Zhang,
  • Shuai Yang,
  • Lifei Pan,
  • Jiapeng Zhong,
  • Pengsheng Chen,
  • Haiyun Zhai

摘要

A dual-emission, ratiometric fluorescence sensor is reported based on a europium(III)-doped metal-organic framework (Eu/DUT-52) that exhibits blue emission from DUT-52 and red emission from Eu³⁺. Notably, we fond that aflatoxin B1 (AFB1) enhances the fluorescence intensity of DUT-52, whereas the Eu³⁺ emission remains essentially unchanged, enabling ratiometric detection with a concentration-dependent color change from pink to purple. We further investigated the origin of this fluorescence enhancement. The ratiometric response provides a detection limit of 3.9 ng mL⁻¹. For field deployment, Eu/DUT-52 was embedded in a hydrogel to form a simple assay kit, and AFB1 was quantified by smartphone-based RGB analysis of fluorescence images, enabling instrument-free readout with a detection limit of 0.04 µg mL⁻¹. The hydrogel sensor shows good selectivity against other mycotoxins and common metal ions with recoveries of 80.59–111.7% in real samples. This work provides a low-cost, recognition-element-free platform for rapid, on-site screening of AFB1.

Graphical abstract