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<p>The persistent existence of flavonoid medications and hazardous ion residues continue to be a&#xa0;concern. Herein, a novel 3D cascade nitrogen-doped carbon dots (N-CDs) based sensing platform for specific detection of rutin and Al<sup>3+</sup> has been developed, utilizing 3,3-diaminobenzidine and catechol as precursors through solvothermal way. The N-CDs exhibit a&#xa0;blue emission peak at 410 nm and a&#xa0;green emission peak at 518 nm. Upon the introduction of rutin, the signal value at 410 nm is significantly reduced by strong inner filter effect (IFE) and weak fluorescence resonance energy transfer (FRET) while the signal value at 518 nm is marginally quenched&#xa0;by weak IFE. Then, with the addition of Al<sup>3+</sup>, the&#xa0;rutin-Al<sup>3+</sup> complex formed&#xa0;causes the decrease of the signal value at 410 nm by strong FRET and weak IFE while the signal value at 518 nm is decreased by strong IFE. Correspondingly, based on the 3D fluorescence excitation-emission matrix, a novel cascade fluorescent sensor is designed, which shows&#xa0;a good linear relationship with the concentration of rutin and Al<sup>3+</sup> within the ranges 0.059–35 μM and 0.098–20 μM, featuring limits of detection (LOD) around 59 nM and 98 nM, respectively. In addition, a fluorescence sensing platform based on the lateral flow assay installation has been&#xa0;developed for portable and on-site detection of rutin and Al<sup>3+</sup>. This work not only broadens the application scope of CDs in sensing fields but also offers a highly effective approach for creating a superior fluorescent sensor to detect rutin and Al<sup>3+</sup>, ultimately enhancing capabilities in environmental monitoring.</p> Graphical abstract <p></p>

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Triggering cascade detection of rutin and Al3+ via 3D ratiometric fluorescent probe through lateral flow assay installation based on dual-emission carbon dots

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Yihao Zhang,
  • Haoming Xing,
  • Houwen Hu,
  • Sineng Gao,
  • Xinru Liu,
  • Linfan Wang,
  • Ting Zhang,
  • Xuan Leng,
  • Da Chen

摘要

The persistent existence of flavonoid medications and hazardous ion residues continue to be a concern. Herein, a novel 3D cascade nitrogen-doped carbon dots (N-CDs) based sensing platform for specific detection of rutin and Al3+ has been developed, utilizing 3,3-diaminobenzidine and catechol as precursors through solvothermal way. The N-CDs exhibit a blue emission peak at 410 nm and a green emission peak at 518 nm. Upon the introduction of rutin, the signal value at 410 nm is significantly reduced by strong inner filter effect (IFE) and weak fluorescence resonance energy transfer (FRET) while the signal value at 518 nm is marginally quenched by weak IFE. Then, with the addition of Al3+, the rutin-Al3+ complex formed causes the decrease of the signal value at 410 nm by strong FRET and weak IFE while the signal value at 518 nm is decreased by strong IFE. Correspondingly, based on the 3D fluorescence excitation-emission matrix, a novel cascade fluorescent sensor is designed, which shows a good linear relationship with the concentration of rutin and Al3+ within the ranges 0.059–35 μM and 0.098–20 μM, featuring limits of detection (LOD) around 59 nM and 98 nM, respectively. In addition, a fluorescence sensing platform based on the lateral flow assay installation has been developed for portable and on-site detection of rutin and Al3+. This work not only broadens the application scope of CDs in sensing fields but also offers a highly effective approach for creating a superior fluorescent sensor to detect rutin and Al3+, ultimately enhancing capabilities in environmental monitoring.

Graphical abstract