High-efficient electrochemical sensing platform based on MOF-doped Au/PEDOT composites toward simultaneous detection of catechin and sunset yellow in tea beverage

Herein, the electrochemical sensing platform has been proposed based on metal-organic framework doped Au/poly(3,4-ethylenedioxythiophene) (PEDOT) composites to simultaneously detect the catechin and sunset yellow in tea beverage. The characterization reveals that the Au nanoparticles distribute well on/in conducting PEDOT, and the relatively few UIO-66 particles as the dopant intersperse the Au/PEDOT composites. The electrochemical test has been used to study the sensing properties toward catechin and sunset yellow simultaneous detection. The results show that the Au/PEDOT/MWCNT-CONH-UIO-66 performs a wide range of 0.03∼60 µM and 0.3∼40 µM, low detection limit as 0.01 μM / 0.15 μM towards catechin and sunset yellow simultaneous detection, respectively. Furthermore, the Au/PEDOT/MWCNT-CONH-UIO-66 possesses a wide linear detection range and high sensitivity for catechin and sunset yellow detection. Moreover, the Au/PEDOT/MWCNT-CONH-UIO-66 composite also has great stability and anti-interference ability. Finally, the sensing platform was applied to detect catechin and sunset yellow in the tea beverage compared with the high-performance liquid chromatography method. To the best of our knowledge, our work first reported the electrochemical sensing materials for catechin and sunset yellow simultaneous detection in food, which will provide a certain theoretical analysis and experimental experience for the preparation of materials used for catechin and sunset yellow simultaneous detection in food.