Electrochemical analysis of indigo carmine using polyarginine modified carbon paste electrode

Abstract

Suitable electro-catalytic technique is established for the selective determination of Indigo Carmine (IC) at poly(arginine) modified carbon paste electrode (PAMCPE). The surface morphological study of the electrode is done through Field Emission Scanning Electron Microscopy (FESEM). The different parameters such as concentration, pH and scan rate on the electrode response are studied. The individual and simultaneous performance of IC and Riboflavin (RF) is carried out through differential pulse voltammetry. The electrocatalytic response of the sensor varied with the concentration of IC in the range from 2×10-7 M to 1×10-6 M and 1.5×10-6 M to 3.5×10-6 M is observed. Limit of detection (LOD) and the limit of quantification (LOQ) is found 2.53×10-8 M and 8.43×10-8 M respectively. The developed PAMCPE successfully shows better electrochemical response towards IC when compared with BCPE. Preparation and characterization of both the electrodes is simple and easier. This has derived a standard method for the determination of IC in real samples.

Keywords

• carbon paste
• electropolymerization
• food dye
• real samples
• cyclic voltammetry
• differential pulse voltammetry