Electrochemical characterization of in situ functionalized gold organosulfur self-assembled monolayer with conducting polymer and carbon nanotubes for determination of rutin.

In this study, attempts were made to present a sensitive strategy for determining rutin. To reach the goal of the study, a poly(sulfosalicylic acid) film was electropolymerized on a gold electrode, which was modified by 2-mercaptobenzothiazole self-assembled monolayer and multi-walled carbon nanotubes (PSSA/CNTs/MBT/Au). The proposed sensor was characterized by different techniques including field emission scanning electron microscopy, energy dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy. The resulting sensor displayed electrocatalytic activity towards the oxidation of rutin which is attributed to the presence of the PSSA/MWCNTs nanocomposite. Under optimized conditions, the detection limit of 1.8nmolL-1 and two linear calibration ranges of 0.01-0.8 and 0.8-10.0µmolL-1 were obtained for rutin determination at the PSSA/CNTs/MBT/Au electrode. The proposed modified electrode was successfully applied for the determination of rutin in orange, red apple, red onion, strawberry, oat and salvia samples. The obtained results suggest that the proposed electrode has several advantages, such as high stability, repeatability and good reproducibility and it can be used for a sensitive, selective and rapid determination of rutin.