Abstract
Zinc oxide nanoflower (ZnONF) was synthesized by a simple process and was used to construct a highly sensitive electrochemical sensor for the detection of sunset yellow (SY). Due to the large surface area and high accumulation efficiency of ZnONF, the ZnONF-modified carbon paste electrode (ZnONF/CPE) showed a strong enhancement effect on the electrochemical oxidation of SY. The electrochemical behaviors of SY were investigated using voltammetry with the ZnONF-based sensor. The optimized parameters included the amount of ZnONF, the accumulation time, and the pH value. Under optimal conditions, the oxidation peak current was linearly proportional to SY concentration in the range of 0.50–10 μg/L and 10–70 μg/L, while the detection limit was 0.10 μg/L (signal-to-noise ratio = 3). The proposed method was used to determine the amount of SY in soft drinks with recoveries of 97.5%–103%, and the results were in good agreement with the results obtained by high-performance liquid chromatography.
Highlights
Sunset yellow (SY) (Scheme 1) is a synthetic dye that is commonly added into food products and soft drinks to make them more visually appealing [1]
Some examples of nanomaterial-modified electrodes developed for the electrochemical determination of sunset yellow (SY) include porous carbon-modified glassy carbon electrode (GCE) [10], gold nanoparticle-modified carbon paste electrode (CPE) [11], gold nanoparticle/graphene-modified GCE [12], Au–Pd and reduced graphene
Electrochemical were measurements conducted a conventional circuit conditions, wave voltammograms recordedwere in the potentialinrange from 0.40–1.0 V, electrochemical cell containing 10 mL of 1/15 mol/L phosphate buffer solution (PBS) with a pH of 5.0, and the oxidation peak current at 0.72 V was measured as the analytical signal for SY
Summary
Yu Ya 1,2 , Cuiwen Jiang 1,2 , Tao Li 1,2 , Jie Liao 1,2 , Yegeng Fan 1,2 , Yuning Wei 1,2 , Feiyan Yan 1,2 and Liping Xie 1,2, *. Quality Inspection and Test Center for Sugarcane and Its Product, China Ministry of Agriculture (Nanning), Nanning 530007, China
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