Electrochemical Detection of Nitrite Based on Co3O4-Au Nanocomposites for Food Quality Control. Issue 10 (13th October 2021)

• Record Type: Journal Article
• Authors: Manikandan, Venkatesh S.; Durairaj, Sharmila; Boateng, Emmanuel; Sidhureddy, Boopathi; Chen, Aicheng
• Is Part Of: Journal of the Electrochemical Society. Volume 168:Issue 10(2021)
• Publication Date: 2021-10-13
• Subjects: Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ac2c14
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Nitrite (NO2 − ) is one of the most intensively studied species in foods owing to its detrimental effects on the human body. Here we report on a high-performance electrochemical sensor based on cobalt oxide nanosheets and gold nanoparticles (Co3 O4 /Au) for the detection of NO2 − . The structural morphology and chemical composition of the nanomaterial were examined using a scanning electron microscope and energy dispersive X-ray spectroscopy. The Au/Co3 O4 /GCE (glassy carbon electrode) was capable of electrooxidizing NO2 − at a low onset potential with a higher anodic peak current over other modified electrodes (bare GCE, Co3 O4 /GCE, and Au/GCE). The analytical performance of the electrochemical sensor was tested using square wave voltammetry. The sensor exhibited good linearity in the selected concentration range from 1.0 to 4000.0 μ M with an R 2 value of 0.999 and the limit of detection (LOD) of 0.11 μ M. The Au/Co3 O4 /GCE demonstrated high selectivity and good stability. Moreover, the Au/Co3 O4 /GCE showed a good anti-interference capacity in the presence of other potential co-existing ions. The performance of the developed sensor was scrutinized further with commercial bottled water and a beef sample with good recovery rates, thereby confirming its plausible applications in food and beverage safety and quality control.