An efficient LSPR method to quantitatively detect dimethoate: Development, characterization and evaluation.
An efficient LSPR method to quantitatively detect dimethoate: Development, characterization and evaluation.
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定量检测乐果的有效 LSPR 方法：开发、表征和评估
DOI：
10.1371/journal.pone.0239632
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发表时间：
2020
期刊：
影响因子：
3.7
通讯作者：
Hu J
中科院分区：
文献类型：
--
作者：
Li D;Zhang Y;Guo Q;Sun X;Zhang H;Wang S;Birech Z;Hu J
近年来，消费者越来越关注水果中的农药污染。因此，迫切需要快速、可靠和一致的检测方法来检测有机磷农药，特别是乐果。现有的乐果定量检测方法不适用于双通道样品的快速检测系统。因此，本文研究了利用双通道系统，利用金纳米粒子（AuNPs）局域表面等离子体共振（LSPR）谱带的吸收变化来检测乐果。在优化条件下，乐果浓度在10-100 nM范围内与吸光度比值（A（520）/A（640））呈线性关系。实验结果表明，两个通道的线性相关系数高达0.97，检测限（LOD）低至5.5 nM。对苹果样品中乐果的检测结果表明，该方法的回收率在85.90%~ 107.37%之间。该双通道LSPR体系为有机磷农药的检测开辟了一条新的途径。为设计基于波分复用开关（WDMS）的高通量农药分析方法奠定了基础。
In recent years, there has been growing concern among consumers about pesticide contamination in fruits. Therefore, rapid, reliable, and consistent detection methods for OPPs, especially dimethoate, are crucially needed. The existing quantitative methods for detecting dimethoate are not suitable for rapid measuring system such as the dimethoate samples from two channels. Hence this paper examines the utilization of a dual-channel system for utilize the absorption variations of the Localized Surface Plasmon Resonance (LSPR) bands of gold nanoparticles (AuNPs) were investigate for detection of dimethoate. Under optimized conditions, the relationship between concentrations of dimethoate and absorbance ratios (A(520)/A(640)) was linearly found in the concentration range of 10–100 nM. Result from the experiment shows that both channels exhibit a linear correlation coefficient as high as 0.97 and a limit of detection (LOD) as low as 5.5 nM. This LSPR detection system was characterized by testing the dimethoate in apple samples and the recovery rates were found to be in the range of 85.90% to 107.37%. The proposed dual-channel LSPR system for detecting dimethoate creating a new approach for detecting organophosphate insecticide in agricultural fields. It could lay the foundation for designing a high-throughput analysis of the insecticides using a wavelength division multiplexing switch (WDMS).
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