在金纳米颗粒/聚吡咯/羧化碳纳米管/玻碳电极上快速扫描速率循环伏安法分析食品中甲基对硫磷残留

IF 8.5 1区农林科学 Q1 CHEMISTRY, APPLIED

Food Chemistry Pub Date : 2025-05-27 DOI:10.1016/j.foodchem.2025.144943

Yun Du, Yuru Shen, Xingyu Zeng, Mingjian Chen, Xike Zeng, Xiaobei Huang, Qingji Xie

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引用次数: 0

摘要

有机磷农药（如甲基对硫磷）残留的定量分析对环境保护和食品安全具有重要意义。本文报道了一种快速扫描速率循环伏安法（CV）分析MP的新方法。传感电极是经过各种仪器表征的金纳米颗粒(AuNPs)/聚吡咯(PPy)/羧化多壁碳纳米管(HOOC-MWCNTs)/玻碳电极（GCE），该电极是通过HOOC-MWCNTs（铸造涂层）、PPy（电聚合）和AuNPs（电沉积）依次修饰GCE而制成的。在含有MP的0.1 M磷酸盐缓冲溶液（pH 6.5）中，AuNPs/PPy/HOOC-MWCNTs/GCE的电位循环显示出一对相当可逆且明显的电还原MP氧化还原峰，从而实现了MP的快速扫描速率CV分析，并显示出0.10 ~ 20.0 μM的线性关系，检测限为5.0 nM （S/N = 3）。植物提取物和环境水样中多聚物的定量分析结果令人满意。

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Rapid scan rate cyclic voltammetry analysis of methyl parathion residues in food on a gold nanoparticles/polypyrrole/carboxylated carbon nanotubes/glassy carbon electrode

Quantitative analysis of organophosphorus-pesticide (e.g., methyl parathion (MP)) residues is important for environmental protection and food safety. Herein, a new method for MP analysis by rapid scan rate cyclic voltammetry (CV) is reported. The sensing electrode is a gold nanoparticles (AuNPs)/polypyrrole (PPy)/carboxylated multiwalled carbon nanotubes (HOOC-MWCNTs)/glassy carbon electrode (GCE) after various instrumental characterizations, which was fabricated by sequentially modifying a GCE with HOOC-MWCNTs (cast-coating), PPy (electropolymerization), and AuNPs (electrodeposition). Potential cycling of the AuNPs/PPy/HOOC-MWCNTs/GCE in 0.1 M phosphate buffer solution (pH 6.5) containing MP shows a pair of rather reversible and evident redox peaks of electroreduced MP, which enables rapid scan rate CV analysis of MP and shows a linearity from 0.10 to 20.0 μM with a limit of detection of 5.0 nM (S/N = 3). The quantitative analysis of MP in vegetable extracts and environmental water samples gives satisfactory results.

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来源期刊

Food Chemistry 工程技术-食品科技

CiteScore

16.30

自引率

10.20%

发文量

3130

审稿时长

122 days

期刊介绍： Food Chemistry publishes original research papers dealing with the advancement of the chemistry and biochemistry of foods or the analytical methods/ approach used. All papers should focus on the novelty of the research carried out.