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A well polished graphite surface was coated with a thin film of N-propylpyridinium chloride silsesquioxane polymer. On to the strongly graphite-adhered polymer film the electroactive species [Fe(CN)6]4- was adsorbed by means of an ion exchange reaction. The resulting electrode (graph/SiPy+)4[Fe(CN)6 ]4- (graph = graphite and SiPy+ represents the N-propilpyridinium silsesquioxane polymer) was chemically very stable and was used to electrocatalytically oxidize ascorbic acid in solution (pH between 4.5-6.5) in 0.1 mol dm-3 KCl. The electrode was used to determine vitamin C in tablets and in processed orange juices. The results were in accord with those obtained by using the standard 2,6-dichlorophenolindophenol titration method.Uma superfície de grafite bem polida foi recoberta com um filme fino do polímero cloreto de n-propilpiridínio silsesquioxano. Sobre o filme do polímero fortemente aderido ao grafite, a espécie eletroativa [Fe(CN)6]4- foi adsorvida por meio de uma reação de troca iônica. O eletrodo resultante, (graph/SiPy+)4[Fe(CN)6 ]4- (graph = grafite e SiPy+ representa o polímero N-propilpiridinio silsesquioxano), mostrou-se quimicamente muito estável e foi utilizado para oxidar eletrocataliticamente o ácido ascórbico em solução de KCl 0,1 mol dm-3, em pH entre 4,5 e 6,5. O eletrodo foi utilizado para determinar vitamina C em tabletes e em sucos de laranja processados. Os resultados mostraram uma boa concordância com aqueles obtidos utilizando o método padrão de titulação com 2,6-diclorofenolindofenol

journal of the brazilian chemical society

N-propylpyridinium chloride silsesquioxane polymer film on graphite: electrochemical study of a hexacyanoferrate (II) ion immobilized electrode for oxidation of ascorbic acid