数字农科院2.0

Fluorescence sensor based on layer-by-layer ligand self-assembled gold nanoclusters for on-site monitoring of chlorpyrifos

文献类型： 外文期刊

作者： He Chen;Li An;Zhong Jin;Juan Zhou;Huan Ma;Jingwei Ma;Meng Li;Di Zhang;Lufei Zheng;Xujin Wu

作者机构：

关键词： Fluorescence sensor;Gold nanoclusters;Layer-by-layer triple-ligand;Organophosphorus pesticides;Self-assembly

期刊名称： Food Chemistry

ISSN： 0308-8146

年卷期： 2025 年 487 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： The application of simple, sensitive, and reliable fluorescence sensors to measure trace targets still remains challenges, especially in identifying ideal fluorophores and developing innovative strategies. Herein, layer-by-layer self-assembly triple-ligand gold nanoclusters (L3-AuNCs) were developed using 6-aza-2-thiothymine, L-arginine, and trimethylphenylammonium, where the three ligands effectively suppressed the non-radiative decay of L3-AuNCs and helped achieve a high absolute quantum yield of 28.34%. More interestingly, L3-AuNCs exhibited a distinctive response to both pH and thiol compound, which can be generated through the acetylcholinesterase catalyzed hydrolysis of acetylthiocholine. Using chlorpyrifos as a model analyte, the limit of detection and linear range for the L3-AuNCs-based fluorescence sensor were 0.10 ng mL−1 and 0.39–50 ng mL−1, respectively. The average recoveries were 83.8%–104.4% in spiked chive, cowpea, celery, and Chinese yam samples. This research opens a new avenue for chlorpyrifos monitoring in the field of food chemistry through material technology innovation.

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