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<p>A novel electrochemical sensor was fabricated by integrating nickel-substituted phosphomolybdate (Ni-PMo<sub>11</sub>) with polyethyleneimine-functionalized carbon nanotube-gold nanoparticles (PEI-MWCNT-AuNPs) for sensitive detection of nitrofurantoin (NFT) in aquatic products. The Ni-PMo<sub>11</sub>/PEI-MWCNT-AuNPs nanocomposite modified glassy carbon electrode demonstrated exceptional electrocatalytic activity toward NFT reduction via a surface-controlled 4e<sup>–</sup>/4H<sup>+</sup> pathway, validated through cyclic voltammetry and electrochemical impedance spectroscopy. Optimized conditions yielded a wide linear range (0.04–40 μM) and low detection limit (0.042 μM) in PBS (pH 5.0). The sensor exhibited excellent stability (50 cycles), repeatability (RSD = 1.5%), reproducibility (RSD = 1.5%), and anti-interference capability (≤ 5% signal deviation against tenfold interferents). Practical application in croaker samples showed recoveries of 88.7–98.3% (RSD 1.1–2.3%), confirming reliability for monitoring NFT residues in food safety control.</p>

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Electrochemical Sensor Based on Nickel-Substituted Phosphomolybdate/Functionalized Carbon Nanotube-Gold Nanoparticles for Nitrofurantoin Detection

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Wending Ye,
  • Yulan Huang,
  • Bingnian Chen,
  • Jinli Zhang,
  • Li Wang

摘要

A novel electrochemical sensor was fabricated by integrating nickel-substituted phosphomolybdate (Ni-PMo11) with polyethyleneimine-functionalized carbon nanotube-gold nanoparticles (PEI-MWCNT-AuNPs) for sensitive detection of nitrofurantoin (NFT) in aquatic products. The Ni-PMo11/PEI-MWCNT-AuNPs nanocomposite modified glassy carbon electrode demonstrated exceptional electrocatalytic activity toward NFT reduction via a surface-controlled 4e–/4H+ pathway, validated through cyclic voltammetry and electrochemical impedance spectroscopy. Optimized conditions yielded a wide linear range (0.04–40 μM) and low detection limit (0.042 μM) in PBS (pH 5.0). The sensor exhibited excellent stability (50 cycles), repeatability (RSD = 1.5%), reproducibility (RSD = 1.5%), and anti-interference capability (≤ 5% signal deviation against tenfold interferents). Practical application in croaker samples showed recoveries of 88.7–98.3% (RSD 1.1–2.3%), confirming reliability for monitoring NFT residues in food safety control.