Catechol (l ,2-dihydroxybenzene) inside charged film on electrode surface— A new voltammetric sensor for vitamin C

Abstract

Catechol shows good reversible cyclic voltammograms inside negative SDS, positive CTAB and zwitterionic phospholipid film on glassy carbon disc electrode in tris buffer (<i>p</i>H 7.0). The mid point potential values with respect to Ag-AgCl reference electrode are found to be +120 mV, +90 mV and +135 mV, respectively. While inside the SDS film, catechol interacts with vitamin C in

solution and the anodic current decreases with increasing concentration of vitamin C without any change in cathodic peak current and position. Although no interaction with vitamin C is observed when catechol is inside CTAB film, the mid-point potential of Catechol inside lipid film is round to shift in negative

direction when encapsulated in lipid film.