Abstract
TiO2-reduced graphene oxide composite-modified glassy carbon electrodes (TiO2–ErGO–GCE) for the sensitive detection of tartrazine were prepared by drop casting followed by electrochemical reduction. The as-prepared material was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Cyclic voltammetry and second-order derivative linear scan voltammetry were performed to analyze the electrochemical sensing of tartrazine on different electrodes. The determination conditions (including pH, accumulation potential, and accumulation time) were optimized systematically. The results showed that the TiO2–ErGO composites increased the electrochemical active area of the electrode and enhanced the electrochemical responses to tartrazine significantly. Under the optimum detection conditions, the peak current was found to be linear for tartrazine concentrations in the range of 2.0 × 10−8–2.0 × 10−5 mol/L, with a lower detection limit of 8.0 × 10−9 mol/L (S/N = 3). Finally, the proposed TiO2–ErGO–GCEs were successfully applied for the detection of trace tartrazine in carbonated beverage samples.
Highlights
With the rapid development of modern life, artificially sweetened beverages attract a lot of children because of their colorful appearance and sweet taste
A novel electrochemical sensor based on graphene–mesoporous TiO2 -modified carbon paste electrodes was developed for the detection of trace tartrazine and exhibited a wide linear detection range (0.02–0.18 μM) and a low detection limit (8.0 nM) using square wave voltammetry (SWV)
These results indicate that the TiO2 –ErGO-glassy electrode (GCE) could be an efficient system for tartrazine detection in carbonate beverage samples
Summary
With the rapid development of modern life, artificially sweetened beverages attract a lot of children because of their colorful appearance and sweet taste. A novel electrochemical sensor based on ionic liquid-modified expanded graphite paste electrode showed excellent sensing performance, including a wide linear response range (0.01 μM–2 μM), low detection limit (3.0 nM), good reproducibility, stability, and reusability [16] These modified electrodes exhibit outstanding sensing performance towards tartrazine, their high costs make them commercially unfavorable. By coupling the merits of 2D graphene materials (larger surface area and high electrical conductivity) with the good catalytic performance of TiO2 semiconductors, the electrochemical properties may be improved for the detection of trace food colorants. A novel electrochemical sensor based on graphene–mesoporous TiO2 -modified carbon paste electrodes was developed for the detection of trace tartrazine and exhibited a wide linear detection range (0.02–0.18 μM) and a low detection limit (8.0 nM) using square wave voltammetry (SWV). The TiO2 –ErGO–GCE was successfully applied for tartrazine detection in a carbonate beverage
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