Detection of Metanil Yellow Adulteration in Turmeric Powder Using Nano Nickel Cobalt Oxide Modified Graphite Electrode

• Published in: IEEE sensors journal Vol. 22; no. 13; pp. 12515 - 12521
• Main Authors: Nag, Shreya, Das, Debangana, Naskar, Hemanta, Tudu, Bipan, Bandyopadhyay, Rajib, Banerjee Roy, Runu
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Cobalt; Cobalt oxides; Crystallites; Electrochemical analysis; electrochemical detection; Electrodes; Graphite; metal oxide; metanil yellow; Nanoparticles; Nickel; Nickel cobalt oxide; Nickel compounds; Powders; Reproducibility; Sensors; turmeric powder; Voltammetry
• ISSN: 1530-437X; 1558-1748
• DOI: 10.1109/JSEN.2022.3178768

A nickel cobalt oxide nanoparticle modified graphite paste electrode (NiCo 2 O 4 @GP) was developed to detect and quantify metanil yellow traces (MY) present in food particles and is presented in this paper. Nanoparticles of nickel cobalt oxide (NiCo 2 O 4 ) were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis revealing 18.75 nm crystallite size and these nanoparticles were used to modify a graphite paste electrode. The performance of the fabricated electrodes was studied using differential pulse voltammetry (DPV) and cyclic voltammetry (CV). NiCo 2 O 4 @GP displayed a wide linear range of 5 to 1000 <inline-formula> <tex-math notation="LaTeX">\mu \text{M} </tex-math></inline-formula> and a limit of detection of 100 nM under optimal experimental conditions. Additionally, NiCo 2 O 4 @GP was highly repeatable, reproducible, and stable over time. Despite interferences such as sodium, potassium, zinc ions, and curcumin, the NiCo 2 O 4 @GP electrode was observed to be highly selective for MY. When exposed to real turmeric powder samples, NiCo 2 O 4 @GP exhibited remarkable electrochemical behavior.