Highly sensitive and rapid determination of sunset yellow in drinks using a low-cost carbon material-based electrochemical sensor

Quang Thuan Tran (1) , Thi Tinh Phung (1) , Quang Trung Nguyen (1) , Truong Giang Le (1) , Corinne Lagrost (2)

1 VAST - Vietnam Academy of Science and Technology
2 ISCR - Institut des Sciences Chimiques de Rennes

Starting from simple graphite flakes, an electrochemical sensor for sunset yellow monitoring is developed by using a very simple and effective strategy. The direct electrochemical reduction of a suspension of exfoliated graphene oxide (GO) onto a glassy carbon electrode (GCE) surface leads to the electrodeposition of electrochemically reduced oxide at the surface, obtaining GCE/ERGO-modified electrodes. They are characterized by cyclic voltammetry (CV) measurements and field emission scanning electron spectroscopy (FE-SEM). The GCE/ERGO electrode has a high electrochemically active surface allowing efficient adsorption of SY. Using differential pulse voltammetry (DPV) technique with only 2 min accumulation, the GCE/ERGO sensor exhibits good performance to SY detection with a good linear calibration for concentration range varying 50-1000 nM (R = 0.996) and limit of detection (LOD) estimated to 19.2 nM (equivalent to 8.9 μg L). The developed sensor possesses a very high sensitivity of 9 μA/μM while fabricated with only one component. This electrochemical sensor also displays a good reliability with RSD value of 2.13% (n = 7) and excellent reusability (signal response change < 3.5% after 6 measuring/cleaning cycles). The GCE/ERGO demonstrates a successful practical application for determination of sunset yellow in commercial soft drinks. Graphical abstract.

Mots clés: Surface modification; Graphene oxide; electrochemical deposition; electrochemical sensor; sunset yellow detection; sensitivity; reusability

Domaines: Chimie analytique; Ingénierie des aliments

Quang Thuan Tran, Thi Tinh Phung, Quang Trung Nguyen, Truong Giang Le, Corinne Lagrost. Highly sensitive and rapid determination of sunset yellow in drinks using a low-cost carbon material-based electrochemical sensor. Analytical and Bioanalytical Chemistry, 2019, 411 (28), pp.7539-7549. ⟨10.1007/s00216-019-02155-9⟩. ⟨hal-02364877⟩