Synthesized of MgO nanoparticles and its application in preparation of electrochemical sensor in vanillin analysis

Vanillin is a phenolic aldehyde, which is an organic compound with the molecular formula C₈H₈O₃. Its functional groups include aldehyde, hydroxyl, and ether. It is the primary component of the extract of thevanilla bean [1]. A carbon paste electrode modified with MgO/NPs and room-temperature ionic liquid, n-hexyl-3- methylimidazolium hexafluoro phosphate was prepared. Figure 1 shows the XRD pattern for MgO nanoparticles synthesized in this work. The electrochemistry of vanillin at the surface of the modified electrode was studied using cyclic voltammetry, chronoamperometry, and electrochemical impedancespectroscopy (EIS). The cyclic voltammogram showed an irreversible oxidation peak at 0.6 V (vs. Ag/AgClsat), which corresponded to the oxidation of vanillin. Compared to common carbon paste electrode, the electrochemical response was greatly improved. Under the optimized conditions, the oxidation peak current of morphine showed two linear dynamic ranges (in 0.08–600 μmol L−1) with a detection limit of 0.02 μmol L−1, using differential pulse voltammetry. The proposed sensor was successfully applied for the determination of vanillin in food samples.

کلیدواژه ها:

Vanillin ، MgO nanoparticles ، Ionic liquids ، Voltammetric analysis