Application of Nanocomposites Based on Graphene and Metal Materials in Measurement of Nitrate/Nitrite in Food Samples

Nitrite (NO2 −) has been broadly applied in industrial and agricultural products; it is often found in various foods, water, environmental systems, and biological samples, though NO2 − is a toxic inorganic contaminant that is hazardous to the health of humans and other organisms. In recent years several approaches have been recommended for detecting and monitoring NO2 − that the electrochemical method is of very attention, among them, due to its easy miniaturization, cost-effective, rapidness, straightforward operation. Graphene nanocomposites have a considerable synergistic electrocatalytic effect toward the nitrite redox, magnifying the electrochemical response signals and improving the sensitivity, selectivity, and feasibility of the nitrite detection in various real samples. In this article, we report the recent developments in electrochemical sensors based on graphene/metal nanocomposites for the measurement of nitrate/nitrite in the food samples and identifying performances, including limit of detection (LOD), detection ranges, pH, sensitivity, stability, and technology used were determined.