An applied potential powered screen-printed electrode for sensitive EC-SERS detection of acetamiprid

文献类型： 外文期刊

第一作者： Tang, Xuemei

作者： Tang, Xuemei;Wu, Ting;Zeng, Wei;Wu, Long;Pan, Fei;Lu, Gen;Fan, Wenying;Wu, Long

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关键词： Acetamiprid; Tropical vegetables; Pesticide residues; Food safety; DFT calculations

期刊名称：SENSORS AND ACTUATORS B-CHEMICAL （ 影响因子：8.4； 五年影响因子：7.2 ）

ISSN：

年卷期： 2024 年 404 卷

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收录情况： SCI

摘要： Acetamiprid (AAP) is a common neonicotinoid pesticide and their residues have emerged as a widely concerned issue on vegetables and fruits. In this work, a facile electrochemical surface -enhanced Raman spectroscopy (ECSERS) method with one step of "mixing and detection" was proposed for detection of AAP. Wherein, screen printed electrode (SPE) was modified by dropping silver nanoparticles (AgNPs) onto the SPE surface. Compared to the normal SERS detection, the EC-SERS had a 5 -fold enhancement in SERS signal with an applied potential at -0.7 V. Under the optimal applied potential, a wide linear range from 0.1 mu M to 1000 mu M was achieved with a low limit of detection (LOD, 0.04 mu M), about 7 -fold lower than that of the normal SERS method (LOD, 0.31 mu M). Density functional theory (DFT) calculation revealed that the van der Waals force between AAP molecules and AgNPs was greatly enhanced. Besides, the EC-SERS method was successfully applied for the detection of AAP in Brassica chinensis L., and the results correlated well (R2 =0.9760) with those obtained from liquid chromatography -tandem mass spectrometry (HPLC-MS). The proposed method featured in easy operation, rapid detection and high sensitivity, which can act as a promising tool for monitoring pesticide residues in food samples.

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