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<p> Residue detection of organophosphorus pesticides is critically important. However, matrix effects in complex feed matrices often led to low purification efficiency and inaccurate recoveries when traditional adsorbents were used. To address this issue, we developed a superhydrophobic melamine sponge through in situ dopamine polymerization, followed by covalent grafting of N-propylethylenediamine silane (PSA) and dodecyl mercaptan. The resulting sponge, which offers abundant adsorption sites and selective water repellency, replaces conventional sorbents in the modified QuEChERS method. Purification was achieved by simply soaking and squeezing the sponge for one minute. The method was validated for 24 organophosphorus pesticides in feed. Excellent linearity (R<sup>2</sup> ≥ 0.996) was obtained over the range of 0.1-2&#xa0;mg/kg. Recoveries ranged from 77.61% to 119.03%, with relative standard deviations below 15%. Limits of detection and quantification were 0.002–0.038&#xa0;mg/kg and 0.008–0.128&#xa0;mg/kg, respectively. Compared with traditional methods, this sponge-based cleanup reduced the purification time by 93% and simplified the procedure, providing a low-cost, practical tool for routine monitoring of complex feed matrices, improving sample throughput.</p> Graphical abstract <p></p>

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Superhydrophobic sponge generated in situ based on dopamine as cleanup absorbent for multi-residue determination of organophosphorus pesticides in feed

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Chunni Wei,
  • Xiangyun Wu,
  • Caiming Xu,
  • Lifang Zhu,
  • Qianyang Zhong,
  • Xiaojing Li,
  • Wen Chen,
  • Minshi Chen,
  • Chun Kit Kwok,
  • Zhenyu Lin,
  • Fang Zhang

摘要

Residue detection of organophosphorus pesticides is critically important. However, matrix effects in complex feed matrices often led to low purification efficiency and inaccurate recoveries when traditional adsorbents were used. To address this issue, we developed a superhydrophobic melamine sponge through in situ dopamine polymerization, followed by covalent grafting of N-propylethylenediamine silane (PSA) and dodecyl mercaptan. The resulting sponge, which offers abundant adsorption sites and selective water repellency, replaces conventional sorbents in the modified QuEChERS method. Purification was achieved by simply soaking and squeezing the sponge for one minute. The method was validated for 24 organophosphorus pesticides in feed. Excellent linearity (R2 ≥ 0.996) was obtained over the range of 0.1-2 mg/kg. Recoveries ranged from 77.61% to 119.03%, with relative standard deviations below 15%. Limits of detection and quantification were 0.002–0.038 mg/kg and 0.008–0.128 mg/kg, respectively. Compared with traditional methods, this sponge-based cleanup reduced the purification time by 93% and simplified the procedure, providing a low-cost, practical tool for routine monitoring of complex feed matrices, improving sample throughput.

Graphical abstract