Ag-Au core-partial shell bimetallic nanoparticles applied in electrochemical determination of the potential endocrine disruptor oryzalin

Silver-gold core-partial shell bimetallic nanoparticles (Ag-Au BMNPs) stabilized in chitosan (CTS) were used to prepare a chemically modified electrode (CME) for the electrochemical determination of oryzalin (ORZ). The Ag-Au BMNPs were deposited on a glassy carbon electrode (GCE) by the simple drop-...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2019-12, Vol.855, p.113484, Article 113484
Main Authors: Gerent, Giles G., Spinelli, Almir
Format: Article
Language:English
Subjects:
Bimetals
Chitosan
Coated electrodes
Core-partial shell structure
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrodes
Electron microscopy
Electrons
Endocrine disruptors
Field emission microscopy
Glassy carbon
Gold
Herbicide
Microscopy
Modified electrode
Nanoparticles
Organic chemistry
Oryzalin
Silver
Silver-gold nanoparticles
Spectrum analysis
Voltammetry
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Summary:Silver-gold core-partial shell bimetallic nanoparticles (Ag-Au BMNPs) stabilized in chitosan (CTS) were used to prepare a chemically modified electrode (CME) for the electrochemical determination of oryzalin (ORZ). The Ag-Au BMNPs were deposited on a glassy carbon electrode (GCE) by the simple drop-coating method to build the modified electrode surface (Ag-Au BMNPs-CTS/GCE). The nanoparticles dispersions were characterized by transmission electron microscopy (TEM), UV–vis spectroscopy (UV–vis) and energy dispersive X-ray spectroscopy (EDS). The CME was characterized by scanning electron microscopy with field emission gun (FEG-SEM) and electrochemical impedance spectroscopy (EIS). The electrochemical behavior of ORZ was investigated by cyclic voltammetry (CV) using the CME. Square-wave voltammetry (SWV) carried out under optimized experimental conditions demonstrated that the cathodic peak current increased with increasing concentrations of ORZ in the range of 0.1–7.0 μmol L−1. The limit of detection obtained from the calibration curve was 30 nmol L−1. The practical application of the Ag-Au BMNPs-CTS/GCE was demonstrated by determining the concentration of ORZ in a grape juice sample. The data obtained were in agreement with those provided by LC-MS/MS as a comparative technique. •Ag-Au core-partial shell bimetallic nanoparticles-modified electrode.•Oryzalin detection in food samples.•Non-mercury based electrode for endocrine disruptors.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2019.113484