Analysis for Vanillin in Food at Imidazole Type Carbon Ionic Liquids Modified Electrode
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Abstract:
A new kind of carbon paste electrode modified with ionic liquid BMIM BF4 was fabricated. In phosphate buffer solution (pH 7.4), cyclic voltammetry and differential pulsc voltammetry were used to investigate the electrochemical behavior of vanillin at the modified dectrode and a new method for selective detection of vanillin was established. The results showed that the electrochemical response was greatly improved with the high conductivity of ILs compared with that of traditional CPE. The vanillin showed a sensitive oxidative peak at 0.440V (VS.SCE), and the peak current was linear to the concentration of vanillin ranging from 2.0 μg/mL-30.0 μg/mL with a detection limit of 1.0 μg/mL. The determination of vanillin hydrochloride was performed and the mechanism for the electrode process was also proposed.
