Determination of maltol in food by cyclic voltammetry with the poly glutamic acid modified electrode

A novel voltammetry methodology was developed for determination of maltol using a poly glutamic acid modified electrode.The poly glutamic acid modified electrode was prepared by cyclic voltammetry.The electrochemical behavior of maltol on the poly glutamic acid modified electrode was studied.The experimental results showed that the poly glutamic acid modified electrode exhibited significant catalytic activity for the electro-oxidation of maltol, compared with the unmodified glassy carbon electrode, the oxidation peak current increased significantly at the poly glutamic acid modified electrode.In the sodium hydrogen phosphate-citric acid buffer solution ( PBS) of p H8.0, an irreversible oxidation peak of matol was obtained by cyclic voltammetry, the oxidation peak current was proportional to the concentration of maltol in the range of 2.40 × 10-6~ 6.61 ×10-4mol/L and the detection limit was 8.0 × 10-7mol/L.The method was applied for the determination of maltol in food with satisfactory recoveries of 98.8% ~103.7%.This method is sensitive, accurate and practical and it has practical significance and application prospects for the determination of matol in a series of food.