Nickel salen NaX nanozeolite modified carbon paste electrode as ascorbic acid electrochemical sensor

Ascorbic acid (AA) is a water-soluble vitamin found in biological systems [1]. Different analytical techniques have been advanced for determination of AA such as liquid chromatography [2] and spectrophotometry [3]. Due to its biological importance, it is essential to develop rapid, selective and sensitive method for its routine and reliable determination in various matrices [1]. Electrochemical technique for the determination of AA represented a lot of attention in the last few years due to its simplicity, low cost, high sensitivity and selectivity [1]. In this study, a type of carbon paste electrode using Ni-salen complexes encapsulated in the NaX nanozeolite was prepared and was used for determination of AA by differential pulse voltammetry (DPV) technique.