Sensitive determination of capsaicin on Ag/Ag2O nanoparticles/reduced graphene oxide modified screen-printed electrode

Ag/Ag 2 O-loaded poly(sodium4-styrenesulfonate) (PSS) functionalized reduced graphene oxide (rGO) composite (Ag/Ag 2 O-PSS-rGO) with high catalytic activity was synthesized for sensitive determination of capsaicin . The prepared composite was characterized by Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). The obtained images revealed the good distribution of Ag/Ag 2 O on the PSS-rGO and confirmed the successful synthesis of the nanocomposite . Adsorptive stripping voltammetry (AdsSV) and differential pulse stripping voltammetry (DPSV) were used to study the electrochemical performance of the prepared sensor, and showed excellent electro-catalytic activity to the redox reaction of capsaicin due to the synergistic effect between Ag/Ag 2 O and PSS-rGO. Under the optimized conditions, the linear range of capsaicin was found to be 1.0–60   μM with a detection limit of 0.40   μM (S/N   =   3).