Simultaneous Quantitation of Caffeic Acid and Ferulic Acid Based on Graphite-like C3N4/chitosan Modified Film

Caffeic acid (CA) and ferulic acid (FA), as the simple phenolic acids, widely exist in plants and food. In this experiment, a novel method based on graphite-like carbon nitride (g-C 3 N 4 ) and chitosan (CS) was applied to determinate CA and FA in food samples. X-Ray diffraction (XRD), fourier transform infrared spectrometer (FTIR), ultraviolet visible spectrophotometer (UV- vis ) and transmission electron microscope (TEM) were illustrated that g-C 3 N 4 was synthesized successfully and had a unique two-dimensional structure. Under the optimized conditions, including the scan rate, pH and so on, the modified electrode had a sensitive response to CA and FA in the range of 1-30 μg/mL and 5-30 μg/mL with the detection limits of 0.354 μg/mL and 4.964 μg/mL (S/N=3), respectively. The electrochemical method showed satisfactory results and provided a new approach to determinate phenolic acids with many advantages, such as rapid response, easy operation, low cost and highly sensitive.