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Determination of Carmoisine onto Carbon‐Paste Electrode Modified by Silica Impregnated with Cetylpyridinium Chloride
Author(s) -
Chebotarev Alexander N.,
Pliuta Konstantin V.,
Snigur Denys V.
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202000518
Subject(s) - cetylpyridinium chloride , chemistry , carbon paste electrode , electrode , calibration curve , nuclear chemistry , electrochemistry , chromatography , detection limit , cyclic voltammetry , biochemistry , pulmonary surfactant
In this paper a simple, cheap and sensitive electrochemical sensor for determination of Carmoisine in soft drinks was developed. Carmoisine is a synthetic azo dye which is used in food products. In this work effective voltammetric sensor based on carbon‐paste electrode modified by silica impregnated with cetylpyridinium chloride to increase the sensitivity of Carmoisine detection was proposed. The voltammetric behavior of Carmoisine, the number of protons and electrons involved in the oxidation process were studied. The probable mechanism of Carmoisine oxidation on the developed sensor was suggested. The optimal conditions for the square‐wave voltammetric determination of Carmoisine onto developed sensor were found to be: pH=2; E ads =400 mV; t ads =300s; A=50 mV; ν=25 Hz, υ=100 mV/s. The calibration curve was linear in the range of Carmoisine concentrations 0,08‐1 μM. The proposed method was successfully tested in the analysis of Carmoisine in soft drinks with RSD not more than 5%.