The voltammetric performance of carbon paste electrode modified with RuO2 nano-road (RuO2/NR) and 1,3-
dipropylimidazolium bromide (DPIBr) (CPE/RuO2/NR/DPIBr) was investigated for the determination of amaranth.
RuO2/NR synthesized by sol gel method and characterized by X-ray powder diffraction (XRD), MAP analysis,
scanning electron microscopy (SEM) and elemental analysis (EDAX) methods. The result revealed that
electrochemical oxidation of amaranth is relative to pH value (one electron and one proton) with an irreversible
oxidation signal. The linear response range of 0.008–550 μM and detection limit of 3.0 nM were found to determination
of amaranth using CPE/RuO2/NR/DPIBr at pH=7.0. CPE/RuO2/NR/DPIBr showed good ability for determination
of amaranth in food samples.
