Screen-printed electrodes modified with green-synthesized gold nanoparticles for the electrochemical determination of aminothiols

Commercially available gold screen-printed electrodes cured at high temperature were modified or functionalized at the surface with gold nanoparticles, mainly produced by a green synthesis method, and other carbon-based nanomaterials in order to enhance the electron transfer between the sulfhydryl g...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2019-08, Vol.847, p.113184, Article 113184
Main Authors: Bernardo-Boongaling, Valeree Ross R., Serrano, Núria, García-Guzmán, Juan José, Palacios-Santander, José María, Díaz-Cruz, José Manuel
Format: Article
Language:English
Subjects:
Aminothiols
Amperometric detection
Anàlisi electroquímica
Carbon nanofibers
Carbon nanotubes
Cromatografia de líquids
Cysteine
Electrical measurement
Electrochemical analysis
Electrodes
Electron transfer
Glutathione
Gold
Gold nanoparticles
High temperature
Linearity
Liquid chromatography
Methionine
Nanomaterials
Nanoparticles
Nanopartícules
Nanotubes
Nanotubs
Reproducibility
Screen-printed electrodes
Voltametria
Voltammetry
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Summary:Commercially available gold screen-printed electrodes cured at high temperature were modified or functionalized at the surface with gold nanoparticles, mainly produced by a green synthesis method, and other carbon-based nanomaterials in order to enhance the electron transfer between the sulfhydryl groups of the aminothiols cysteine (Cys), methionine (Met), glutathione (GSH) and homocysteine (hCys) and the electrode. The electrochemical characterization by cyclic and differential pulse voltammetry of some of the modified electrodes showed an improved performance in terms of sensitivity, reproducibility, repeatability, linearity range and limits of detection (12, 1, 0.2 and 1μmolL−1 for Cys, Met, GSH, hCys, respectively) and quantification (40, 2, 0.5 and 2μmolL−1 for Cys, Met, GSH, hCys, respectively) as compared to unmodified units. Then, some of these modified devices were successfully applied to the determination of cysteine and methionine in dietary supplements by means of liquid chromatography with amperometric detection. [Display omitted] •Commercial gold screen-printed electrodes were modified with green-synthesized gold nanoparticles and carbon-based nanomaterials•The performance of the modified electrodes for the electrochemical detection of aminothiols was compared•Modified electrodes were used to determine cysteine and methionine by liquid chromatography with amperometric detection
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2019.05.066