Electrochemical oxidation, adsorption and quantification of 1,2-benzopyrone employing a glassy carbon electrode

• Autor(a) principal: Azevedo,Luiz Fernando M. de
• Data de Publicação: 2014
• Outros Autores: Trevisan,Marcello G., Garcia,Jerusa S., Lucho,Alzira M. S.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Chemical Society (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532014000300009
• topic: 1,2-benzopyrone; guaco; adsorption process; multivariate optimization

The electrooxidation of 1,2-benzopyrone (BP) was assessed via linear voltammetry and electrochemical impedance spectroscopy on a glassy carbon electrode in dibasic potassium phosphate buffer. The oxidation process for BP requires one electron and forms a ketone. This oxidation product was adsorbed by the electrode surface to form a film that blocks active sites and increases in thickness over consecutive measurements. The oxidation conditions were optimized using factorial design and Doehlert matrices. This electrochemical method was compared to high performance liquid chromatography (HPLC), which has a detection limit of 26.4 µmol L-1 for BP. The voltammetric results were statistically similar to those from HPLC; however, the method was faster, simpler, more easily acquired, more sensitive, and required less organic solvent.