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<p>A&#xa0;novel bottom-up green approach is presented&#xa0;for synthesizing blue fluorescent sulfur quantum dots (SQDs) utilizing L-cysteine as the sulphur source and the unique structure of carboxymethyl cellulose macromolecule as the passivating agent. The method accomplishes synthesis within a shortened reaction time of only 4&#xa0;h. The formation of SQDs involves three steps: heating of L-cysteine to produce H<sub>2</sub>S, which then reacts with H<sub>2</sub>O<sub>2</sub> to form elemental sulphur, eventually assembling into SQDs. The prepared SQDs exhibit favorable water dispersibility and photostability, rendering them highly suitable for fluorescent sensors. Notably, fluorescence detection experiments reveal that fluorescence resonance energy transfer (FRET) between the SQDs and curcumin (Cur) results in diminished fluorescence of the SQDs (F<sub>435</sub>) and an increase in scattered light signal (S<sub>690</sub>). In addition, it shows promising ratiometric linearity of the Cur concentration in the range 0.10–12.00&#xa0;µM with an impressive limit of detection of 19&#xa0;nM. This work not only provides valuable insights into the green and convenient sustainable preparation of SQDs but also opens up avenues for their versatile applications.</p> Graphical abstract <p></p>

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Novel SQDs synthesized using L-cysteine bottom-up strategy based on FRET and second-order scattering for ratiometric detection of curcumin

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Jinxia Xu,
  • Jin Ning,
  • Fanyong Yan,
  • Shanshan Li,
  • Yang Fu,
  • Yang Xu

摘要

A novel bottom-up green approach is presented for synthesizing blue fluorescent sulfur quantum dots (SQDs) utilizing L-cysteine as the sulphur source and the unique structure of carboxymethyl cellulose macromolecule as the passivating agent. The method accomplishes synthesis within a shortened reaction time of only 4 h. The formation of SQDs involves three steps: heating of L-cysteine to produce H2S, which then reacts with H2O2 to form elemental sulphur, eventually assembling into SQDs. The prepared SQDs exhibit favorable water dispersibility and photostability, rendering them highly suitable for fluorescent sensors. Notably, fluorescence detection experiments reveal that fluorescence resonance energy transfer (FRET) between the SQDs and curcumin (Cur) results in diminished fluorescence of the SQDs (F435) and an increase in scattered light signal (S690). In addition, it shows promising ratiometric linearity of the Cur concentration in the range 0.10–12.00 µM with an impressive limit of detection of 19 nM. This work not only provides valuable insights into the green and convenient sustainable preparation of SQDs but also opens up avenues for their versatile applications.

Graphical abstract