Rapid voltammetric determination of maltol in some foods and beverages using a poly(methylene blue)/ graphene-modified glassy carbon electrode

摘要

A novel poly(methylene blue)/graphene composite glassy carbon electrode was fabricated and the electrochemical behavior of maltol at the modified electrode was studied by cyclic voltammetry. In phosphate-buffered solution, the modified electrode exhibited excellent electrocatalytic activity towards the electrochemical oxidation of maltol. Under optimized conditions, the oxidation peak current showed a linear relationship with the concentrations of maltol in the ranges of 8.00×10~(-7) to 4.00×10~(-5) and 4.00× 10~(-5) to 5.40×10~(-4) mol L~(-1), with a detection limit of 6.50× 10~(-8) mol L~(-1). The performance of the developed method was validated in terms of linearity (r =0.9981 and 0.9955), recovery (97.0-99.3 %), reproducibility (relative standard deviations≤3.1 %, n =6), and robustness. The method shows excellent sensitivity, selectivity, and reproducibility and has been successfully applied to analyzing maltol in a wide variety of food products.