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<p>A gold-doped MOF-79 composite was synthesized and subsequently applied as an electrochemical sensing material for the determination of quercetin in seawater. Considering that quercetin is widely used as a pharmaceutical compound and may pose potential ecological risks when released into aquatic environments, the development of a simple and reliable detection method was of practical significance. To this end, a novel Au@MOF-79 composite was prepared via a hydrothermal route and was characterized by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The obtained Au@MOF-79 was drop-cast onto a glassy carbon electrode to fabricate the Au@MOF-79/GCE sensor. Electrochemical measurements demonstrated that the Au@MOF-79/GCE exhibited enhanced electrocatalytic activity toward quercetin oxidation and enabled its quantitative determination using differential pulse voltammetry. A good linear relationship between the oxidation peak current and quercetin concentration was obtained in the range of 3.04 × 10⁻⁵ to 1.196 × 10⁻³ M, with a detection limit of 6.0 × 10⁻⁶ M. Furthermore, the sensor showed good repeatability and short-term operational stability, and maintained satisfactory analytical performance in seawater samples. The improved sensing performance was attributed to the synergistic effect between the porous MOF-79 framework and uniformly dispersed Au nanoparticles, which facilitated analyte enrichment and electron transfer. These results indicated that the Au@MOF-79-modified electrode had potential for the electrochemical detection of quercetin in complex aqueous environments.</p>

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The electrochemical sensor Au@MOF-79 toward the quercetin detection in seawater

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月16日

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  • Fangzheng Duan,
  • Huimin Yang,
  • Chunyu Qiao,
  • Jin Chen,
  • Peng Lin,
  • Qi Ge

摘要

A gold-doped MOF-79 composite was synthesized and subsequently applied as an electrochemical sensing material for the determination of quercetin in seawater. Considering that quercetin is widely used as a pharmaceutical compound and may pose potential ecological risks when released into aquatic environments, the development of a simple and reliable detection method was of practical significance. To this end, a novel Au@MOF-79 composite was prepared via a hydrothermal route and was characterized by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The obtained Au@MOF-79 was drop-cast onto a glassy carbon electrode to fabricate the Au@MOF-79/GCE sensor. Electrochemical measurements demonstrated that the Au@MOF-79/GCE exhibited enhanced electrocatalytic activity toward quercetin oxidation and enabled its quantitative determination using differential pulse voltammetry. A good linear relationship between the oxidation peak current and quercetin concentration was obtained in the range of 3.04 × 10⁻⁵ to 1.196 × 10⁻³ M, with a detection limit of 6.0 × 10⁻⁶ M. Furthermore, the sensor showed good repeatability and short-term operational stability, and maintained satisfactory analytical performance in seawater samples. The improved sensing performance was attributed to the synergistic effect between the porous MOF-79 framework and uniformly dispersed Au nanoparticles, which facilitated analyte enrichment and electron transfer. These results indicated that the Au@MOF-79-modified electrode had potential for the electrochemical detection of quercetin in complex aqueous environments.