Detection of Allura Red in Food Samples Using Carbon Paste Modified with Lanthanum and Titanium Oxides

Vargas-Varela A.; Cardenas-Riojas A.A.; Nagles E.; Hurtado J. · ChemistrySelect (2023) · DOI: 10.1002/slct.202204737

Resumen

This report describes a new electroanalytical application for the detection of Allura Red (AR) using a carbon paste electrode (CPE) modified with lanthanide oxide and titanium oxide (LaOX-TiOX/CPE). The standard potential (Eo) for oxidation of AR was obtained from the E (V) vs. pH relation with the regression equation Ep(V)=−0.038pH+0.922, where the intercept on the axis Ep(V) is equal to the standard potential. Moreover, the anodic peak current for AR was increased almost 160 % compared to the unmodified electrodes, and this current increase allowed us to obtain a detection limit of 0.09 μmol/L. The active surface area of the modified electrode La-TiOX/CPE is reported for the first time in this report and was increased by almost 200 % compared to the unmodified electrodes. The usefulness of the new method was tested by analyzing real food samples with acceptable results. The real samples do not need pretreatment before analysis.

Instituciones: Universidad Nacional Mayor de San Marcos; Universidad Nacional de Ingeniería