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Characterization of ABTS at a Polymer‐Modified Electrode
Author(s) -
Thomas Jennifer H.,
Drake J. Michael,
Paddock Jean R.,
Conklin Sean,
Johnson Jay,
Seliskar Carl J.,
Halsall H. Brian,
Heineman William R.
Publication year - 2004
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200302862
Subject(s) - cyclic voltammetry , vinyl alcohol , polymer , absorbance , indium tin oxide , polymer chemistry , electrode , vinyl chloride , chemistry , abts , materials science , inorganic chemistry , electrochemistry , organic chemistry , copolymer , chromatography , dpph , antioxidant
ABTS, 2,2′‐azinobis(3‐ethylbenzothiazoline‐6‐sulfonate), a colorless dianion that forms a colored radical upon oxidation, was characterized with electrochemistry and spectroscopy and demonstrated to be a detectable analyte in a polymer‐modified spectroelectrochemical sensor. Three positively charged polymers were incorporated into a thin film on an indium tin oxide (ITO) optically transparent electrode and used to concentrate ABTS at the electrode surface. Of the three films, poly(vinylbenzyl trimethyl ammonium chloride)‐poly(vinyl alcohol) (PVTAC‐PVA), poly(diallyldimethylammonium chloride)‐silica (PDMDAAC‐SiO 2 ), and quaternized poly(4‐vinyl‐ N ‐methylpyridinium nitrate)‐silica (QPVP‐SiO 2 ), PVTAC‐PVA demonstrated the best ability to absorb ABTS. Within 20 min, a change of 0.2 absorbance units at 417 nm and 13.6 μA/cm 2 in anodic peak current density in cyclic voltammetry at a scan rate of 0.025 V/s were observed.