A novel platform based on MnO2 nanoparticles and carboxylated multi-walled carbon nanotubes composite for accurate and rapid determination of curcumin in commercial food products

In this paper, a sensitive electrochemical sensor based on MnO2 nanoparticles functionalized carboxylated multi -walled carbon nanotubes (MnO2-c-MWCNTs) was prepared for the determination of curcumin. The synthesized materials have been fully characterized by instruments, such as X-ray diffraction (XRD), scanning electron mi-croscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The electro-chemical behavior of curcumin on the MnO2-c-MWCNTs modified glassy carbon electrode (MnO2-c-MWCNTs/ GCE) was investigated in detail by CV and chronocoulometry (CC). The electrochemical reaction mechanism of curcumin on the modified electrode was also discussed. In 0.1 M H2SO4 solution, the peak current showed a good linear dependence on curcumin concentration in the range of 0.01-1 mu M and 1-80 mu M, The method has high sensitivity (3.30 mu A mu M-1 cm( -1)), and the detection limit is 6.0 nM. At the same time, the MnO2-c-MWCNTs/GCE has good anti-interference ability and stability. In addition, the sensor was used for the accurate and rapid determination of curcumin in commercial food samples, which shows its good potential for practical application.

Automated summary

In this study, a sensitive electrochemical sensor using MnO2 nanoparticles functionalized carboxylated multi-walled carbon nanotubes (MnO2-c-MWCNTs) was prepared for the determination of curcumin. The synthesized materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The electrochemical behavior and reaction mechanism of curcumin on the modified electrode were investigated in detail. The sensor showed high sensitivity (3.30 mu A mu M-1 cm(-1)) and a low detection limit of 6.0 nM, as well as good anti-interference ability and stability. It was successfully applied for the accurate and rapid determination of curcumin in commercial food samples, demonstrating its practical potential.