Abstract
A facile cuprous oxide nanoparticles functionalized electro-reduced graphene oxide modified glassy carbon electrode (denoted as Cu2O NPs-ERGO/GCE) was fabricated via a simple physical adsorption and electrochemical reduction approach. Cyclic voltammetry and second-order derivative linear scan voltammetry were used to investigate the electrocatalysis oxidation of vanillin on the Cu2O NPs-ERGO/GCE. The compound yielded a well-defined voltammetric response in 0.1 M H2SO4 at 0.916 V (vs. saturated calomel electrode (SCE)). A linear calibration graph was obtained in the concentration range of 0.1 μM to 10 μM and 10 μM to 100 μM, while the detection limit (S/N = 3) is 10 nM. In addition, the Cu2O NPs-ERGO/GCE presented well anti-interference ability, stability, and reproducibility. It was used to detect vanillin sensitively and rapidly in different commercial food products, and the results were in agreement with the values obtained by high performance liquid chromatography.
Highlights
Vanillin is a phenolic aldehyde and the primary component of the extract of the vanilla bean with the molecular formula C8 H8 O3 (4-hydroxy-3-methoxybenzaldehyde)
2 O-ERGO nanocomposites were investigated by scanning electron microscopy (SEM)
The results showed that effective surface area of the modified electrode was obviously increased, it would increase the the effective surface area of the modified electrode was obviously increased, it would increase the adsorption capacity of vanillin and lead to enhance the current response
Summary
Vanillin is a phenolic aldehyde and the primary component of the extract of the vanilla bean with the molecular formula C8 H8 O3 (4-hydroxy-3-methoxybenzaldehyde). As a result of some merits of fast response, high sensitivity, simple operation, and low cost, electrochemical methods have been tried and developed for the detection of vanillin. Some chemically modified electrodes have been reported [1,8,9,10,11,12,13,14,15,16] The performance of these sensors is heavily dependent on the modified materials. Sensors modified with graphene/metal oxides have been widely reported [18,19]. Because of its enhanced catalytic activity and high adsorption capacity, the prepared Cu2 O nanoparticles functionalized electro-reduced graphene oxide modified glassy carbon electrode (NPs-ERGO/GCE) can be used as an effective electrochemical sensor for sensitive determination of vanillin. For further confirmation of the feasibility of practical application, the vanillin contents in some commercial food products were determined
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