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<p>Herein, highly fluorescent blue-emitting carbon dots (B-CDs) were synthesized via a facile one-pot hydrothermal method using folic acid (FA) and tris(hydroxymethyl)aminomethane (Tris) as co-precursors. The synergistic effects of FA’s nitrogen-rich aromatic structure and Tris’s hydroxyl-rich dendritic architecture enabled controlled heteroatom doping, endowing the CDs with excellent optical properties. The B-CDs exhibited strong blue fluorescence (emission at 446&#xa0;nm under 360&#xa0;nm excitation), excellent water solubility, remarkable photostability, and a high quantum yield of 25.27%. Utilizing these B-CDs, we developed an “on-off-on” fluorescent nanoprobe for the dual detection of Ag<sup>+</sup> and glutathione (GSH). The mechanism involves Ag<sup>+</sup>-induced fluorescence quenching via static quenching, followed by GSH-triggered recovery due to Ag<sup>+</sup>/GSH chelation. Under optimal conditions, there were great linear relationships between [I<sub>0</sub>/I-1] and the concentration of Ag<sup>+</sup>, [I<sub>2</sub>/I<sub>1</sub>-1]and the concentration of GSH, with low detection limits of 17.45 nM and 80.95 nM, respectively. Furthermore, based on the “on-off-on” fluorescent sensing platform, Ag<sup>+</sup> was effectively detected in mineral water &amp; river water, and GSH was detected in tomato &amp; green pepper.</p>

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Facile One-Pot Synthesis of Folic Acid-Derived Carbon Dots for Selective “on-off-on” Fluorescence Detection of Ag+ and Glutathione with High Sensitivity

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Lijuan Chen,
  • Yuting Ding,
  • Changchang Chen,
  • Xiaoyan Jiang,
  • Danni Yang,
  • Jingwen Li,
  • Hong Liu,
  • Linlin Yang

摘要

Herein, highly fluorescent blue-emitting carbon dots (B-CDs) were synthesized via a facile one-pot hydrothermal method using folic acid (FA) and tris(hydroxymethyl)aminomethane (Tris) as co-precursors. The synergistic effects of FA’s nitrogen-rich aromatic structure and Tris’s hydroxyl-rich dendritic architecture enabled controlled heteroatom doping, endowing the CDs with excellent optical properties. The B-CDs exhibited strong blue fluorescence (emission at 446 nm under 360 nm excitation), excellent water solubility, remarkable photostability, and a high quantum yield of 25.27%. Utilizing these B-CDs, we developed an “on-off-on” fluorescent nanoprobe for the dual detection of Ag+ and glutathione (GSH). The mechanism involves Ag+-induced fluorescence quenching via static quenching, followed by GSH-triggered recovery due to Ag+/GSH chelation. Under optimal conditions, there were great linear relationships between [I0/I-1] and the concentration of Ag+, [I2/I1-1]and the concentration of GSH, with low detection limits of 17.45 nM and 80.95 nM, respectively. Furthermore, based on the “on-off-on” fluorescent sensing platform, Ag+ was effectively detected in mineral water & river water, and GSH was detected in tomato & green pepper.