Electrochemical behavior of amaranth and its sensitive determination based on Pd-doped polyelectrolyte functionalized graphene modified electrode.

In this work, poly(sodium p-styrenesulfonate) (PSS)-functionalized graphene supported palladium nanoparticles (Pd) composites were fabricated with simple ultrasonic bath method. The morphology and structure of PSS-GR-Pd composites were characterized using UV–vis absorption spectra, X-ray diffraction and Transmission Electron Microscopy. By combining the merits of the PSS-GR and Pd NPs, a new electrochemical sensor was erected to detect amaranth based on the PSS-GR-Pd nanocomposites. The electrochemical behavior of amaranth was investigated systematically in 0.1 mol L −1 phosphate buffer solution (PBS 2.0). At the optimum parameter, I pa was found to be linearly dependent on the concentrations of amaranth (1×10 −7 –9×10 −6 mol L −1 ). The detection limit was 7 nM (S/N=3) and sensitivity was 5.85 μA μM −1 . Finally, this system was utilized for determining amaranth in soft drink using the standard addition method. [ABSTRACT FROM AUTHOR]