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<p>This work reports a novel one-pot hydrothermal synthesis of N-CQDs using <i>Solanum nigrum L</i>. as sustainable carbon source and triethylamine as nitrogen provider. The resulting N-CQDs were systematically characterized with TEM, SEM, FT-IR, XPS, XRD, and UV–Visible. Significantly, the N-CQDs exhibited substantial antimicrobial efficacy against both <i>S. aureus</i> and <i>E. coli</i> bacterial strains, with minimum inhibitory concentration values of 1.2&#xa0;mg/mL and 1.1&#xa0;mg/mL, respectively. Moreover, the N-CQDs demonstrated pronounced fluorescence enhancement upon interaction with ciprofloxacin, displaying exceptional selectivity and sensitivity, with a calculated LOD of 316 nM. The feasibility of employing N-CQDs as fluorescent probes for ciprofloxacin detection was systematically validated through practical application in honey analysis. This study introduces a novel approach for the fabrication of N-CQDs derived from natural botanical sources, underscoring their potential dual functionality as fluorescent sensors and antimicrobial materials.</p>

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Synthesis and properties of carbon quantum dots as an antimicrobial agent and detection of ciprofloxacin

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月5日

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  • Fangzhou Shen,
  • Zhaoyang Lu,
  • Kangli Yan,
  • Kang Luo,
  • Shuchen Pei,
  • Pu Xiang

摘要

This work reports a novel one-pot hydrothermal synthesis of N-CQDs using Solanum nigrum L. as sustainable carbon source and triethylamine as nitrogen provider. The resulting N-CQDs were systematically characterized with TEM, SEM, FT-IR, XPS, XRD, and UV–Visible. Significantly, the N-CQDs exhibited substantial antimicrobial efficacy against both S. aureus and E. coli bacterial strains, with minimum inhibitory concentration values of 1.2 mg/mL and 1.1 mg/mL, respectively. Moreover, the N-CQDs demonstrated pronounced fluorescence enhancement upon interaction with ciprofloxacin, displaying exceptional selectivity and sensitivity, with a calculated LOD of 316 nM. The feasibility of employing N-CQDs as fluorescent probes for ciprofloxacin detection was systematically validated through practical application in honey analysis. This study introduces a novel approach for the fabrication of N-CQDs derived from natural botanical sources, underscoring their potential dual functionality as fluorescent sensors and antimicrobial materials.