Colorimetric determination of the pesticide chlorothalonil based on the aggregation of gold nanoparticles
文献类型： 外文期刊
作者： Liu, Qingju 1 ; Han, Ping 1 ; Gong, Wenwen 1 ; Wang, Hui 1 ; Feng, Xiaoyuan 1 ;
作者机构： 1.Beijing Res Ctr Agr Stand & Testing, Beijing 100097, Peoples R China
2.Minist Agr, Risk Assessment Lab Agroprod Beijing, Beijing 100097, Peoples R China
关键词： Vegetable; UV-Vis spectrometry; HPLC; Spiking; Nanomaterial; Pesticide; Transmission electronmicroscopy; IR
期刊名称：MICROCHIMICA ACTA （ 影响因子：5.833； 五年影响因子：5.357 ）
ISSN： 0026-3672
年卷期： 2018 年 185 卷 7 期
页码：
收录情况： SCI
摘要： A method is described for the determination of the pesticide chlorothalonil (CLT). It is based on the finding that citrate-capped gold nanoparticles (AuNPs) undergo aggregation on exposure to chlorothalonil. This is accompanied by a visually detectable color change from wine red to blue. The effect is due to the interaction of the cyano group of chlorothalonil with gold nanoparticles. The assay may also be performed by using a spectrometer. The ratio of absorbances at 700 nm and 520 nm (A(700)/A(520)) linearly drops in the 5 to 100 ng.mL(-1) CLT concentration range, with a 3.6 ng.mL(-1) detection limit. This is below the Chinese guideline value for cucumber. The method is rather simple and does not require any modification of the AuNPs or the utilization of antibody. It was successfully applied to the determination of CLT in (spiked) cucumber samples. Recoveries ranged from 80.4 to 97.4%, and the analytical results compared well with those obtained by HPLC.
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