A molecularly imprinted electrochemiluminescence sensor based on mimic enzyme ZIF-90 and MnO2/g-C3N4 magnetic particles for detection of methidathion

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL

Microchimica Acta Pub Date : 2024-10-17 DOI:10.1007/s00604-024-06753-y

Ziyu Huang, Guangwei Yang, Qiuling Deng, Xuhui Zhang, Xiaoping Wei, Jianping Li

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引用次数: 0

Abstract

Methidathion (MTDT), a common organophosphorus pesticide with high insecticidal activity, is widely used for pest control. However, the misuse of MTDT leads to widespread residues and endangers human health. Therefore, it is crucial to develop a simple and highly sensitive method for the detection of MTDT residues. Herein, ZIF-90/MnO₂/g-C₃N₄/Fe₃O₄ composite particles were synthesized: The MnO₂ nanosheets could absorb the energy of the excited g-C₃N₄ to quench the ECL of g-C₃N₄ while ZIF-90 acted as a mimetic enzyme to catalyze the formation of thiocholine from MTDT. The thiocholine caused the reduction of MnO₂ to Mn²⁺, restoring the ECL signal of g-C₃N₄. Combined with molecular imprinting technique, an electrochemiluminescence sensor was constructed for the determination of MTDT. The determination range was 1.00 × 10^–9 ~ 7.00 × 10^–7 g/L, and the detection limit was 6.58 × 10^–10 g/L. Structurally similar organophosphorus pesticides showed no cross-reactivity. The method has high sensitivity and specificity, and has been successfully applied to the determination of MTDT residue in fruits with recoveries in the range 93.75% ~ 102.37%.

Graphical abstract

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基于模拟酶 ZIF-90 和 MnO2/g-C3N4 磁性颗粒的分子印迹电化学发光传感器用于检测甲硫磷

甲拌磷（MTDT）是一种常见的有机磷杀虫剂，具有很高的杀虫活性，被广泛用于害虫防治。然而，MTDT 的滥用导致其广泛残留并危及人类健康。因此，开发一种简单、高灵敏度的 MTDT 残留检测方法至关重要。本文合成了 ZIF-90/MnO2/g-C3N4/Fe3O4 复合颗粒：MnO2 纳米片可以吸收激发 g-C3N4 的能量，淬灭 g-C3N4 的 ECL，而 ZIF-90 则作为模拟酶催化 MTDT 生成硫代胆碱。硫代胆碱使 MnO2 还原成 Mn2+，恢复了 g-C3N4 的 ECL 信号。结合分子印迹技术，构建了用于测定 MTDT 的电化学发光传感器。测定范围为 1.00 × 10-9 ~ 7.00 × 10-7 g/L，检出限为 6.58 × 10-10 g/L。结构相似的有机磷农药无交叉反应。该方法灵敏度高、特异性强,已成功应用于水果中MTDT残留量的测定,回收率为93.75%～102.37%。

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来源期刊

Microchimica Acta 化学-分析化学

CiteScore

9.80

自引率

5.30%

发文量

410

审稿时长

2.7 months

期刊介绍： As a peer-reviewed journal for analytical sciences and technologies on the micro- and nanoscale, Microchimica Acta has established itself as a premier forum for truly novel approaches in chemical and biochemical analysis. Coverage includes methods and devices that provide expedient solutions to the most contemporary demands in this area. Examples are point-of-care technologies, wearable (bio)sensors, in-vivo-monitoring, micro/nanomotors and materials based on synthetic biology as well as biomedical imaging and targeting.