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.
Highlights
Dyes are the colored compounds of either synthetic or natural origin
Preparation of polyarginine modified carbon paste electrode Arginine solution of 10-3 M was placed in electrochemical cell containing 0.1 M phosphate buffer solution (PBS) of pH 5.7
The surface morphological investigations of carbon paste electrode (CPE) and polyarginine modified carbon paste electrode (PAMCPE) were assessed by Field emission scanning electron microscopy (FESEM)
Summary
Synthetic dyes are used in various industries like printing textiles, paint, cosmetics, pulp, and even in food industry [1] Their degradation products are highly poisonous and dangerous to all living beings [2]. Indigo carmine (IC) (5,5′ indigodisulphonic acid sodium salt) is one such dyes used in cosmetic industry [3], food industry and in coloring of polyester fibers [4,5]. It is toxic in nature and can cause diarrhea and vomiting in human beings [6]. A susceptible and selective procedure for determination of IC would be of immense significance
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