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<p>The extensive use of tricyclazole pesticide poses a serious threat to humans and the ecosystem, thus there is an urgent need to develop a sensitive and rapid detection method. In this study, a novel β-cyclodextrin (β-CD)/phenolphthalein (PP) supramolecular probe was designed for the determination of tricyclazole in water. Tricyclazole and β-CD formed a 1:1 inclusion complex in aqueous solution at 25°C by using UV-visible spectra according to the Benesi–Hildebrand method. Phenolphthalein and tricyclazole compete to enter the hydrophobic cavity of β-CD due to host–guest recognition, causing changes in absorbance. Based on this principle, the β-CD/PP supramolecular probe exhibits a wide detection scope (1.0 × 10<sup>–5</sup>–3.0 × 10<sup>–4</sup> M) and moderate detection limits of 1.22 × 10<sup>–5</sup> M for tricyclazole detection under the optimal conditions. The optimal geometries for the host and guest molecules were determined by density functional theory (DFT) calculations. Molecular docking analysis demonstrated the optimal PP and tricyclazole orientation inside the cavity of β-CD, and revealed the inherent driving forces of the inclusion reaction between β-CD and the guest molecules. Gibbs free energy change (∆G) values indicate that β-CD/tricyclazole is more stable than β-CD/PP inclusion complex. In addition, the β-CD/PP probe exhibited a high selective performance toward tricyclazole in water, and the β-CD/PP probe can be applied to detect tricyclazole in real water samples with satisfactory recoveries (93.8–101.8%). This simple strategy establishes the potential for determining other pesticides by host–guest recognition that match the β-CD hydrophobic cavity.</p>

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β-Cyclodextrin Phenolphthalein Supramolecular System as Probe for Detecting Trace Tricyclazole by Competitive Host–Guest Inclusion

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Ming Xiu Ma,
  • Xiaoyan Chen,
  • Bing Li,
  • Shujuan Ding,
  • Zhiqiang Wu,
  • Heping Li,
  • Wanyi Liu

摘要

The extensive use of tricyclazole pesticide poses a serious threat to humans and the ecosystem, thus there is an urgent need to develop a sensitive and rapid detection method. In this study, a novel β-cyclodextrin (β-CD)/phenolphthalein (PP) supramolecular probe was designed for the determination of tricyclazole in water. Tricyclazole and β-CD formed a 1:1 inclusion complex in aqueous solution at 25°C by using UV-visible spectra according to the Benesi–Hildebrand method. Phenolphthalein and tricyclazole compete to enter the hydrophobic cavity of β-CD due to host–guest recognition, causing changes in absorbance. Based on this principle, the β-CD/PP supramolecular probe exhibits a wide detection scope (1.0 × 10–5–3.0 × 10–4 M) and moderate detection limits of 1.22 × 10–5 M for tricyclazole detection under the optimal conditions. The optimal geometries for the host and guest molecules were determined by density functional theory (DFT) calculations. Molecular docking analysis demonstrated the optimal PP and tricyclazole orientation inside the cavity of β-CD, and revealed the inherent driving forces of the inclusion reaction between β-CD and the guest molecules. Gibbs free energy change (∆G) values indicate that β-CD/tricyclazole is more stable than β-CD/PP inclusion complex. In addition, the β-CD/PP probe exhibited a high selective performance toward tricyclazole in water, and the β-CD/PP probe can be applied to detect tricyclazole in real water samples with satisfactory recoveries (93.8–101.8%). This simple strategy establishes the potential for determining other pesticides by host–guest recognition that match the β-CD hydrophobic cavity.