Original scientific paper
https://doi.org/https://doi.org/10.5599/jese.3341
Graphene oxide/NiO nanocomposite-modified carbon paste electrode for the simultaneous detection of carmoisine and tartrazine as two azo dyes in food samples
Fares A. Yasseen
; Department of Physics, Faculty of Science, University of Kufa, Al-Najaf, Iraq
*
Ali Obaid Imarah
; Chemical Engineering Department, College of Engineering, University of Babylon, Iraq
Rasha Faris Hadi
; Faculty of Education, Department of Chemistry, University of Hilla, Babylon, 51001, Iraq
Huda Hadi Nameh
; Faculty of Education, Department of Chemistry, University of Hilla, Babylon, 51001, Iraq
* Corresponding author.
Abstract
A carbon paste electrode (CPE) was modified with a graphene oxide (GO)/NiO nanocomposite (GO/NiO/CPE) and used as the working electrode for the voltammetric analysis of carmoisine. In the oxidation of carmoisine, the GO/NiO/CPE showed increased electrocatalytic activity. With a detection limit of 0.1 μM under ideal conditions, the oxidation peak currents of carmoisine were linearly proportional to its concentration over the range 0.3 to 500.0 μM. Additionally, the GO/NiO/CPE showed good efficacy in detecting carmoisine even in the presence of tartrazine, suggesting that both chemicals might be determined simultaneously. The GO/NiO/CPE was appropriate for the simultaneous detection of carmoisine and tartrazine using differential pulse voltammetry because the oxidation peak potentials of the two azo dyes were adequately separated by 420 mV.
Keywords
Food colorants; electrochemical sensing; hybrid composite; voltammetry; powdered juice
Hrčak ID:
351277
URI
Publication date:
29.4.2026.
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