Analytical Sciences

Abstract − Analytical Sciences, 33(10), 1123 (2017).

Determination of Brilliant Blue FCF by a Novel Solid-state ECL Quenching Sensor of Ru(bpy)32+-poly(sulfosalicylic acid)/GCE
Xiaohui CHEN,* Jiahao YIN,** Chao ZHANG,** Nian LU,** and Zhidong CHEN**
*School of Chemistry and Material Engineering, Changzhou Vocational Institute of Engineering, Changzhou 213164, P. R. China
**School of Materials Science & Engineering, Changzhou University, Changzhou 213164, P. R. China
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.