Determination of Brilliant Blue FCF by a Novel Solid-state ECL Quenching Sensor of Ru(bpy)₃²⁺-poly(sulfosalicylic acid)/GCE

抄録

A novel solid-state electrochemiluminescence (ECL) quenching sensor was constructed for determination of brilliant blue FCF (BB FCF). Under a simple electropolymerization step, poly(sulfosalicylic acid) (PSSA) film attached luminophore Ru(bpy)₃²⁺ was successfully formed on the surface of a glass carbon electrode [Ru(bpy)₃²⁺–PSSA/GCE], which exhibited excellent ECL behavior. A high quenching effect on the ECL signal of the Ru(bpy)₃²⁺–PSSA/GCE was obtained with the presence of low concentration of BB FCF. Moreover, the quenched ECL intensity showed a linear relation within the BB FCF concentration range of 0.5 – 7 and 7 – 10 μmol/L, with a detection limit of 57 nmol/L (S/N = 3). Besides, Ru(bpy)₃²⁺–PSSA/GCE exhibited good reproducibility and was successfully applied in the practical detection of BB FCF in peppermint candy samples.