This paper presents a new application for a screen-printed carbon electrode (SPCE) modified with chitosan (Cs) and manganese oxide (II). This new electrode (Cs-MnOX/SPCE) was applied in the detection of tartrazine (TZ) by linear scan voltammetry (LSV). The anodic peak current for TZ increased by nearly 500 % compared with Cs/SPCE and unmodified SPCE. The surface of the electrode was characterized by cyclic voltammetry. The detection limit was 0.06 μmol/L. The relative standard deviations (RSDs) were between 1.0 and 6.0 % (n=15). The accuracy of the new method was evaluated with real samples spiked with known quantities of TZ.
Bibliographical noteFunding Information:
E. N. thanks the Universidad Nacional Mayor de San Marcos (project C20071301 and C21070961) for financial support and Angelica Baena and Andy Cardenas from Laboratorio de Investigación de Electroquímica Aplicada, Facultad de Ciencias, Universidad Nacional de Ingeniería. Lima. Additionally, J.H. thanks the Research Fund of the Faculty of Sciences of the Universidad de los Andes and the Chemistry Department for providing funding (project no. INV‐2020‐105‐2038).
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- Lineal scan voltammetry
- carbon paste
- manganese oxide (II)