Ultrasensitive and rapid detection of organophosphates using a dual-signal naked-eye hydrogel sensor based on acetylcholinesterase inhibition

文献类型： 外文期刊

第一作者： Wang, Jiachun

作者： Wang, Jiachun;Huang, Yibing;Kuai, Ziyu;Zhang, Yanping;Shen, Qi;Tian, Pujing;Nong, Weihai;Jiang, Wantong;He, Yuting;Ran, Nana;Yin, Yinuo;Luo, Quan;Li, Tiezhu;Luo, Quan

作者机构：

关键词： Acetylcholinesterase inhibition; Gold nanozyme; Organophosphorus pesticide; Dual signal readout; Self-calibration method

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.5； 五年影响因子：8.7 ）

ISSN： 0141-8130

年卷期： 2024 年 283 卷

页码：

收录情况： SCI

摘要： Accurate determination of pesticide residues is crucial for food safety. A self-calibration method was developed for dual-signal "naked-eye" detection of organophosphorus pesticides (OPs) using bifunctional gold nanozymes (AuNEs). OPs inhibit the cascade reaction of acetylcholinesterase/choline oxidase (AChE/CHO) to reduce hydrogen peroxide (H2O2) production, which affects the AuNE-catalyzed color reaction and quenches the fluorescence of AuNEs with the assistance of Fe2+. The multi-enzyme cascade system can be integrated into hydrogel sheets for smartphone-assisted digital, quantitative, and onsite detection of OPs in real food samples by analyzing the linear changes in colorimetric and fluorometric signals, which closely match liquid chromatography-mass spectrometry (LC-MS) results. This method displays a lowest 'naked-eye' detection concentration of 7 ppb, a wide linear range (0-2000 ng/mL), and particularly the advantage of anti-interference via self-calibration when one of the signals is abnormal.

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