Monitoring and management of sunset yellow in sports drinks by electrochemical sensor

A novel electrochemical sensing method based on CuN-T/GCE modified electrode was developed for the sensitive and selective determination of sunset yellow (SY) in sports drinks. The research offers several advantages over existing techniques, such as rapid response time, low cost, and ease of operation. The modified electrode exhibited enhanced electrocatalytic activity towards SY oxidation compared to the bare electrode, resulting in an increased peak current and a reduced potential difference. The linear range of the method was from 50 nM to 10 µM, with a detection limit of 13 nM (S/N = 3). The reproducibility of the method was demonstrated with a relative standard deviation of 3.31%. The optimized conditions included the use of 0.1 M PBS buffer at pH 7.0 and a modifier content of 10 µL. The method was successfully applied to the determination of SY in sports drinks, showing high accuracy and precision with recovery rates ranging from 96.0 to 107.0%.