ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Determination of nitrite in food samples on MnO₂ decorated carbonaceous-glass fiber modified glassy carbon by differential pulse voltammetry

İlknur Üstündağ

Department of Physics, Faculty of Arts and Science, Kutahya Dumlupinar University, Kutahya, Turkey

E-mail: iozkirim@gmail.com

Received: 24 December 2022  Accepted: 1 April 2023

Abstract:

Nitrite is widely used as an additive in the food industry. Nitrite can form carcinogenic N-nitrosamines by reacting with secondary amines and amides in the stomach and can interfere with the oxygen transport system in the body. Therefore, it is important to detect nitrite residues from a variety of environments, including food samples. This study presents the determination of nitrite using a novel sensitive electrochemical sensor based on MnO₂ decorated coal tar pitch-coated glass fiber scaffold. Characterizations of sensor platforms were performed using electrochemical, spectroscopic, and microscopic techniques. Response of the carbonaceous electrode using differential pulse voltammetry for nitrite in the presence of uric acid and resorcinol was found linear in the range of 0.5–25 μM. The detection limit of nitrite was 2.5 nM (S/N ratio = 3). The method was successfully applied for the detection of nitrite in food samples including juice, pickle, pasteurized milk, and tap water samples.

Keywords: Nitrite; Differential pulse voltammetry; Food analysis; Carbonaceous materials

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-02811-6

Chemical Papers 77 (8) 4613–4623 (2023)