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

Publication date: 1 June 2017
Source:Talanta, Volume 168
Author(s): Yudong Gao, Lu Wang, Yulong Zhang, Lina Zou, Gaiping Li, Baoxian Ye
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 0.1molL⁻¹ phosphate buffer solution (PBS 2.0). At the optimum parameter, Ipa was found to be linearly dependent on the concentrations of amaranth (1×10⁻⁷–9×10⁻⁶molL⁻¹). The detection limit was 7nM (S/N=3) and sensitivity was 5.85μAμM⁻¹. Finally, this system was utilized for determining amaranth in soft drink using the standard addition method.

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