Determination of Vanillin in Infant Formula Using Poly Valine Modified Electrode

A poly valine modified electrode was prepared by cyclic voltammetry. The electrochemical behavior of vanillin at the modified electrode was studied in detail. A new method for measuring vanillin was established. It was found that in pH 7.0 phosphate buffer solution, the oxidation peak current is linearly propertional to its concentration of vanillin in a range of 9.60×10-8 ~6.61×10-5 mol L-1, with a limit of detection of 1.00x10-8 mol L-1. This method is simple, highly sensitive and shows good reproducibility. The method has been demonstrated in the determination of vanillin in infant formula samples.