基于修饰丝网印刷电极上的预富集信号放大对洛克沙胂进行电化学测定。

Electrochemical determination of Roxarsone using preconcentration-based signal amplification on modified screen-printed electrode.

作者信息

Ferreira Luís M C, Martins Paulo R, Silva Cristiane G, Marcolino-Junior Luiz H, Bergamini Marcio F, Vicentini Fernando C

机构信息

Center of Nature Sciences, Federal University of São Carlos, Rod. Lauri Simões de Barros km 12, 18290-000 Buri, SP, Brazil; Laboratory of Electrochemical Sensors (LabSensE) - Department of Chemistry, Federal University of Paraná, 81.531-980, Curitiba, PR, Brazil.

Institute of Chemistry, Federal University of Goiás, Av. Esperança, Goiania, GO 74690-900, Brazil.

出版信息

Food Chem. 2023 Oct 9;437(Pt 1):137698. doi: 10.1016/j.foodchem.2023.137698.

DOI:10.1016/j.foodchem.2023.137698

PMID:39491248

Abstract

A lab-made screen-printed electrode based on poly(ethylene terephthalate) (PET) substrate modified with a hybrid film containing gold nanoparticles-decorated graphene (AuNPs-GRA/PET-SPE) was employed for the voltammetric determination of Roxarsone (ROX) in chicken purge and river water samples. The electrode exhibited an increased electroactive area and enhanced charge transfer due to the nanostructured matrix. The electrochemical determination involved a preconcentration approach with a reduction step of ROX at a constant potential of -0.6 V, followed by voltammetric sweep towards the oxidation of the adsorbed hydroxylamine at 0.32 V. The methodology achieved a limit of detection of 60 nM and 97 nM for ROX in diluted river water and chicken purge samples, respectively. This effective methodology offers a promising tool for monitoring ROX levels in environmental and food samples.

摘要

一种基于聚对苯二甲酸乙二酯（PET）基底的实验室自制丝网印刷电极，该基底用含有金纳米粒子修饰的石墨烯的混合膜（AuNPs-GRA/PET-SPE）进行了改性，用于伏安法测定鸡肉清洗液和河水样品中的洛克沙胂（ROX）。由于纳米结构基质，该电极展现出增大的电活性面积和增强的电荷转移。电化学测定采用预富集方法，在-0.6 V的恒定电位下对ROX进行还原步骤，随后在0.32 V下对吸附的羟胺进行氧化的伏安扫描。该方法对稀释河水和鸡肉清洗液样品中ROX的检测限分别为60 nM和97 nM。这种有效的方法为监测环境和食品样品中的ROX水平提供了一种有前景的工具。