Graphite carbon nitride-modified screen-printed electrode as a highly sensitive and selective sensor for detection of amaranth.

This work presented a particular electrochemical sensor for analysis of amaranth, an azo toxic dye. A graphite nitride carbon (g-CN) was used to modify an electro-treated screen-printed electrode (g-CN/SPE) for electroanalysis of amaranth. Physicochemical characteristics and analytical performance of g-CN/SPE were investigated by relevant equipment. The g-CN/SPE when comparing with bare SPE, possessed an impressive electrocatalytic performance towards the amaranth oxidation. As-developed sensor under the optimal circumstances exhibited an extended linear response range for different amaranth concentrations of 0.08 μM-340.0 μM, with a narrow practical limit of detection (LOD) of 0.02 μM, a limit of quantification (LOQ) of 0.08 μM, and an unparalleled sensitivity of 0.0702 μA/μM using differential pulse voltammetry (DPV). The applicability of as-fabricated sensor was verified by determining the amaranth in real samples, with acceptable recoveries.