Determination of Allura Red in the presence of cetylpyridinium bromide by square-wave adsorptive stripping voltammetry on a glassy carbon electrode

Resultado de la investigación: Contribución a una revistaArtículo

4 Citas (Scopus)

Resumen

A simple method to determine Allura Red (AR) in cherry gelatin, chili sauce and strawberry juice by square-wave adsorptive stripping voltammetry (SWAdV) in the presence of cetylpyridinium bromide (CPB) is reported. Using a glassy carbon electrode (GCE), Amaranth (AM), Ponceau 4R (P-4R) and AR were oxidized to very close potential values in medium acid pH 3.0 with phosphate buffer solution (PBS), making selective AR detection impossible. Under these conditions AM, P-4R and AR were oxidized at 0.80, 0.77 and 0.81 V, respectively. When small amounts of CPB were added, an AR-CPB aggregate was formed. This change displaced the oxidation almost 0.14 V in the direction of the most positive potential and increased the current almost 50%, while AM and P-4R were oxidized at almost the same potential. Under these conditions, the selective determination of AR in food was possible. Detection limit was 0.032 μmol L-1. Finally, the method was successfully applied to the determination of AR in these foods.

Idioma originalInglés
Páginas (desde-hasta)1171-1175
Número de páginas5
PublicaciónAnalytical Sciences
Volumen34
N.º10
DOI
EstadoPublicada - 1 ene 2018

Palabras clave

  • Allura Red
  • Amaranth
  • Cetylpyridinium bromide
  • Glassy carbon electrode
  • Ponceau 4R

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