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<p>A fast fluorescent dual-emission platform for sensitive detection of sodium dehydroacetate (SDHA) in food is established utilizing bimetallic organic frameworks (Eu@Zr-MOFs). Eu@Zr-MOFs show two fluorescent emissions at 430&#xa0;nm and 616&#xa0;nm under single excitation wavelength of 290&#xa0;nm. Two peaks separated by 180&#xa0;nm help to eliminate environmental interference and improve the accuracy. In the presence of SDHA, fluorescent intensity at 430&#xa0;nm and 616&#xa0;nm shows fluorescent quenching within 1&#xa0;min. Fluorescent lifetime results show that fluorescent quenching is a static quenching mode. Fluorescent quenching may be ascribed to the diketone structure of SDHA coordinated with Eu<sup>3+</sup> and internal filtering effect. The logarithm of fluorescent intensity (lg<i>I</i><sub>430 nm</sub> * <i>I</i><sub>616 nm</sub>) has linear relationship with the concentration of SDHA from 0.1 µM to 200 µM with a limit of detection of 31.6 nM. More conveniently, it also achieves visual detection of SDHA through fluorescent color by portable UV lamp and smartphone “color capture” mode. The platform is applied to detect SDHA in fermented and baked food samples. Thus it is an efficient and sensitive fluorescent ratio method for SDHA detection with fast response, high selectivity and accuracy.&#xa0;</p> Graphical Abstract <p></p>

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Fast fluorescent dual-emission platform for sensitive detection of sodium dehydroacetate in food utilizing bimetallic organic framework (Eu@Zr-MOFs)

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Long Tan,
  • Rui Xiao,
  • Di Wu,
  • Lianzhe Hu,
  • Yan Zhang,
  • Wenjing Qi

摘要

A fast fluorescent dual-emission platform for sensitive detection of sodium dehydroacetate (SDHA) in food is established utilizing bimetallic organic frameworks (Eu@Zr-MOFs). Eu@Zr-MOFs show two fluorescent emissions at 430 nm and 616 nm under single excitation wavelength of 290 nm. Two peaks separated by 180 nm help to eliminate environmental interference and improve the accuracy. In the presence of SDHA, fluorescent intensity at 430 nm and 616 nm shows fluorescent quenching within 1 min. Fluorescent lifetime results show that fluorescent quenching is a static quenching mode. Fluorescent quenching may be ascribed to the diketone structure of SDHA coordinated with Eu3+ and internal filtering effect. The logarithm of fluorescent intensity (lgI430 nm * I616 nm) has linear relationship with the concentration of SDHA from 0.1 µM to 200 µM with a limit of detection of 31.6 nM. More conveniently, it also achieves visual detection of SDHA through fluorescent color by portable UV lamp and smartphone “color capture” mode. The platform is applied to detect SDHA in fermented and baked food samples. Thus it is an efficient and sensitive fluorescent ratio method for SDHA detection with fast response, high selectivity and accuracy. 

Graphical Abstract