Adsorptive stripping voltammetric determination of Amaranth and tartrazine in drinks and gelatins using a screen-printed carbon electrode

Yeny Perdomo, Verónica Arancibia, Olimpo García-Beltrán, Edgar Nagles

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A fast, sensitive, and selective method for the simultaneous determination of one pair of synthetic colorants commonly found mixed in food products, Amaranth (AM) and Tartrazine (TZ), based on their adsorption and oxidation on a screen-printed electrode (SPE) is presented. The variation of peak current with pH, supporting electrolyte, adsorption time, and adsorption potential were optimized using square wave adsorptive voltammetry. The optimal conditions were found to be: pH 3.2 (PBS), Eads 0.00 V, and tads 30 s. Under these conditions, the AM and TZ signals were observed at 0.56 and 0.74 V, respectively. A linear response were found over the 0.15 to 1.20 µmol L−1 and 0.15 to 0.80 µmol L−1 concentrations, with detection limits (3σ/slope) of 26 and 70 nmol L−1 for AM and TZ, respectively. Reproducibility for 17.7 µmol L–1 AM and TZ solutions were 2.5 and 3.0% (n = 7), respectively, using three different electrodes. The method was validated by determining AM and TZ in spiked tap water and unflavored gelatin spiked with AM and TZ. Because a beverage containing both AM and TZ was not found, the method was applied to the determination of AM in a kola soft drink and TZ in an orange jelly and a soft drink powder.

Original languageEnglish
Article number2665
JournalSensors
Volume17
Issue number11
DOIs
StatePublished - 18 Nov 2017

Bibliographical note

Funding Information:
Acknowledgments: The authors thank COLCIENCIAS for the financial support offered under Grant Acknowledgments: The authors thank COLCIENCIAS for the financial support offered under Grant #130774559056 Colombia, and the Universidad de Ibagué (projects 15-376-INT and 16-416-INT) is gratefully #130774559056 Colombia, and the Universidad de Ibagué (projects 15-376-INT and 16-416-INT) is

Publisher Copyright:
© 2017 by the authors. Licensee MDPI, Basel, Switzerland.

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

Keywords

  • Adsorptive stripping voltammetry
  • Amaranth
  • Drinks
  • Gelatins
  • Screen-printed carbon electrode
  • Tartrazine

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