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Authentical Screening of Tea Beverages Based on Voltammetric Profile

The voltammetric profiles of tea beverages vary among brands and products due to the presence of different types and concentrations of electro-active compounds. These differences are determined by the factory process, recipe and tea leaf selection. In this communication, we proposed a quick and low-cost method for recording the electro-active compound profile in tea beverages based on the direct insertion of a three-electrode system into beverage liquid. The polyphenol compounds in tea beverages can be oxidized during a differential pulse voltammetric scan. By using the peak criterion with a ratio calculated from major peaks, DPV profiles can be used to identify twelve different tea beverages in this work. The stable profile recording performance along with clustering analysis suggests that the proposed method can be effectively used for authentic identification of tea beverages. We believe that the proposed methodology can be further extended to other food quality screening applications.