**3.3.3 Electrocatalytic oxidation of ascorbic acid**

Finally the oxidation of aa was analysed in the copolymer and comparated with those of homopolymers, Figure 17 show the ascorbic acid oxidation on the different films, immersed in 1 M H2SO4 solution in the absence and in the presence of different concentrations of ascorbic acid. An increase in intensity of the anodic current peak, as the acid ascorbic concentration was increased is an indication of catalytic oxidation of ascorbic acid mediated for each film. The effect catalytic of polyluminol in the oxidation of aa is well established (Chen & Lin, 2002), however the electrocatalysis in polyANS and copolymer has been not reported. The current obtained for a same concentration of aa is higher in the polyANS this suggest that the catalysis is more favourable for this film.
