One-pot electrodeposition of metal organic frameworks composites accelerated by electroreduced graphene oxide and gold nanoparticles for rutin electroanalysis

Rutin plays an important role in treating human diseases and improving immunity, and it is still necessary to develop an effective method for the detection of rutin. Herein, metal organic frameworks (MOFs) composites consisting of MOFs, electro-reduced graphene oxide (ErGO) and gold nanoparticles (AuNPs) were reported for sensitive electroanalysis of rutin. The MOFs composites were prepared by one-pot electrodeposition. Interestingly, ErGO and/or AuNPs are found to significantly accelerate the electrodeposition of MOFs, and are used as good conducive agent to enhance the conductivity of MOFs composites. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), fourier transform infrared spectrometer (FT-IR), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) were used to characterize the properties of the ErGO-AuNPs-MOFs composites. Kinetic behavior of rutin detection at ErGO-AuNPs-MOFs composites were studied by CV. The proposed sensor shows linear range from 7.0 x 10(-9) to 1.4 x 10(-7) mol/L and 1.4 x 10(-7) to 4.0 x 10(-7) mol/L for rutin with a detection limit of 3.44 nmol/L (S/N = 3). The sensor shows acceptable reproducibility, repeatability, anti-interference ability and stability. The sensor was also used to detect rutin in actual tablets samples with satisfactory recovery.

Automated summary

This study reported a composite material consisting of metal organic frameworks (MOFs), electro-reduced graphene oxide (ErGO), and gold nanoparticles (AuNPs) for sensitive electroanalysis of rutin. The composite showed a good detection limit, acceptable stability, and reproducibility.