Amplified electrochemical sensor employing ZnO-CuO nanoplates for sensitive analysis of Sudan I

ABSTRACT

The occurrence of Sudan I has become an important subject in food safety, as it has been classified as a category 3 carcinogen by the IARC. In the present work, ZnO-CuO nanoplates were successfully synthesised and applied for changing the screen-printed electrode sensing Sudan I. Sudan I electrochemical behaviours were examined by chronoamperometry, differential pulse voltammograms (DPV) and cyclic voltammetry . Data gained by voltammetric approved a considerable increase in the current of oxidation and decrease of overvoltage for Sudan I electro-oxidation at ZnO-CuO/SPE surface. DPV response shows the linear augmentation of the signals sent by oxidation with the increased concentration of sudan I ranging between 0.6 and 600.0 μM with a limited detection of 0.18 μM. Finally, the ZnO-CuO/SPE was employed as a highly sensitive tool to analyse Sudan I in real samples.

KEYWORDS:

• Sudan I
• ZnO-CuO nanoplates
• graphite screen-printed electrodes
• voltammetry

Disclosure statement

No potential conflict of interest was reported by the authors.