Sensor development and analytic applications for polyfenol derivative antioxidants

In this study; coated film electrodes which can be selective against polyphenol-derived antioxidants such as gallic acid, caffeic acid and catechin side-by-side and / or against one or several of these antioxidants. For this purpose, the characterizations of polyimide and polyurethane based polymers were performed by FTIR, SEM, DSC, TGA and DTA and liquid contact angles were measured. Polymer film electrodes were then prepared by dropping the polyimide and the polyurethanes from the solution in n-methylpyrrolidone (NBS) onto the platinum electrode. Parameters such as polymer type, drying time and polymer film thickness have been optimized to prevent electroactive interferences such as ascorbic acid, coumaric acid, and sucrose, maltose, fructose and glucose on the amperometric sensor characteristics of the prepared polymer electrodes. The selectivity, stability and susceptibility of gallic acid, caffeic acid and catechin sensors prepared later were evaluated in addition to interferences. As a result; the polymer coated electrodes separately prepared for each of them interferes with the interferences; gallic acid, caffeic acid and catechin were shown to give regular DPV responses. The regulatory coefficient for gallic acid, caffeic acid and catechin, respectively, (R2) 0.9935, 0.9938, 09933; limit of determination (LOD), 0.081, 1.522, 0.069 and the quantitation limit (LOQ) values were calculated as 0.081, 1.522, 0.069. electrochemical sensors for gallic acid, caffeic acid and catechin were successfully developed.