Effect of holding time on electrochemical analysis of milk antioxidants using PEDOT electrodes Online publication date: Fri, 22-Mar-2019
by Mahsa Moteshakeri; Jadranka Travas-Sejdic; Paul A. Kilmartin
International Journal of Nanotechnology (IJNT), Vol. 15, No. 8/9/10, 2018
Abstract: Antioxidant compounds, such as ascorbic acid and uric acid, are the main contributors to the total antioxidant capacity of milk. In this study, a new chemically modified electrode was constructed based on a conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) to investigate the effect of holding time on the electrochemical detection of these antioxidants. Cyclic voltammetry results showed that pre-adsorption of uric acid at the PEDOT surface at different times not only improved the current responses but would also allow a more sensitive response at low concentrations. Surprisingly, no stringent attention in terms of holding time was required to analyse uric acid in milk, which can be measured in untreated milk (pH c. 6.6). The PEDOT-based sensor is also able to detect ascorbic acid added to milk, but to obtain a measureable signal the pH needs to be lowered to around pH 3. The PEDOT-modified electrode provides a sensitive sensor approach for real applications in milk antioxidant determination.
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