A Selective Catalytic Oxidation of Ascorbic Acid at the Aminopyrimidyl Functionalized-Conductive Polymer Electrode

A simple detection method of ascorbic acid (AA) through selective catalytic oxidation has been developed using a novel conducting polymer poly-3-(2-aminopyrimidyl)-2,2:5,2-terthiophene (pAPTT). The pAPTT electrode showed an excellent selectivity in facilitating the electron transfer of AA and blocked the interferences of cationic species due to the positively charged pAPTT film. This method proved to be effective in the determination of AA in the presence of various biological interfering species. The dynamic range of AA detection was from 10 to 200 mu M and the detection limit was 1.4 +/- 0.06 mu M.