Potentiometric Sensor System Based on Modified Thick-Film Electrodes for Determining the Antioxidant Activity of Beverages

Abstract

Currently, the food industry pays great attention to the research of antioxidants used as food additives and functional food ingredients. Monitoring the antioxidant activity (AOA) of foods containing dietary antioxidants serves as an innovative tool for the food industry development and is an urgent research task. The article presents data on the development, research and application of a single-use potentiometric sensor system based on modified thick-film electrodes made by screen printing to determine the beverages AOA. In the sensor system, the thick-film carbon-containing electrode (TCE) is modified with gold nanoparticles (AuNP), and the thick-film silver-containing electrode (TSE) is modified with a precipitate of silver chloride and ferricyanide (O) and covered with a protective Nafion layer (N). The researchers analyzed the electrochemical and operational characteristics of AuNP/TCE and N/O/TSE. A man found that carbohydrates (glucose, fructose and sucrose) did not affect, and ethyl alcohol affected the potential change in the electrochemical cell and, thus, the amount of antioxidant activity of the drink. The authors provide methodological approach for results correcting of determining the antioxidant activity of alcoholic beverages. The results of AOA beverages determining obtained using commercial electrodes and the developed sensor system are in good agreement (according to the criteria of Fischer and Student).