▎ 摘　　要

In this work, we report a simple but efficient voltammetric sensor for Ponceau 4R detection, based on gold nanoparticles (AuNPs) and electrochemical reduced graphene oxide (ERGO) nanocomposites for a screen-printed electrode (AuNPs/ERGO/SPE). AuNPs are uniformly deposited on ERGO nanoparticles, providing a good interface for the adsorption and subsequent oxidation of the target assays. In this way, ERGO offers a particular surface area for AuNPs. A simple electrochemical sensor with very high detection sensitivity would be made by electrochemical deposition method for measuring Ponceau 4R. Supporting electrolytes with different pHs were examined, showing the strong dependency of measurements to pH. In addition to pH, the effect of accumulation time and potential was also investigated, and its optimal value was recorded. Under the optimal experimental conditions, the response of this sensor was linear in the range of 0.03 mu M to 10 mu M with a detection limit of 5.2 nM. SPE made with this composite had a favorable and effective electrocatalytic effect on the oxidation of ponceau 4R. In addition, these sensors are cheap, portable, and simple, with excellent repeatability and reproducibility.