Electrochemical Behavior and Sensitive Methods of the Voltammetric Determination of Food Azo Dyes Amaranth and Allura Red AC on Amalgam Electrodes
| Autor: | Sofiia Tvorynska, Jiří Barek, Liliya Dubenska, Bohdan Josypčuk |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Allura Red AC 010401 analytical chemistry Inorganic chemistry chemistry.chemical_element Amaranth 04 agricultural and veterinary sciences Electrochemistry 040401 food science 01 natural sciences Applied Microbiology and Biotechnology 0104 chemical sciences Analytical Chemistry Mercury (element) chemistry.chemical_compound 0404 agricultural biotechnology Adsorption chemistry Hanging mercury drop electrode Adsorptive stripping voltammetry Electrode Safety Risk Reliability and Quality Safety Research Food Science |
| Zdroj: | Food Analytical Methods. 12:409-421 |
| ISSN: | 1936-976X 1936-9751 |
| DOI: | 10.1007/s12161-018-1372-1 |
| Popis: | The novel and highly sensitive methods for individual determination of two food azo dyes Amaranth (AM, E 123) and Allura Red AC (AR, E 129) in the commercial beverages were successfully developed on two types of silver solid amalgam electrodes, namely mercury meniscus modified (m-AgSAE) and liquid mercury free polished (p-AgSAE) amalgam electrodes, using differential pulse adsorptive stripping voltammetry (DP-AdSV) and direct current adsorptive stripping voltammetry (DC-AdSV) for the first time. In addition, the reduction processes of AM and AR on amalgam electrodes were compared with the processes on hanging mercury drop electrode. The influence of pH, accumulation potential, and accumulation time on the signal enhancement of AM and AR were investigated. The number of electrons and the number of protons participating in the rate-determining step of the reduction process for azo dyes were calculated. Due to the significantly increasing reduction peak currents of AM and AR on m-AgSAE and p-AgSAE caused by their adsorption at the electrode surface, the amalgam electrodes exhibit the wide linear ranges and good sensitivity to the determination of AM and AR. For example, the limits of detection were found to be 2.1 × 10−9 mol L−1 for AM and 3.4 × 10−9 mol L−1 for AR on m-AgSAE using DC-AdSV. Moreover, the amalgam electrodes showed good repeatability (RSD lower than 5.0% for 5 × 10−8 mol L−1 of tested azo dyes) and stability and it was confirmed that these electrodes are useful tools to azo dye monitoring in a food safety control field. |
| Databáze: | OpenAIRE |
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