Author/Authors :
Harry B. Mark Jr.، نويسنده , , Jr، نويسنده , , Hong Zhang، نويسنده , , Suzanne K. Lunsford، نويسنده , , Ozcan Ceylan، نويسنده , , Anthony I Khaskelis، نويسنده , , Nada Atta، نويسنده , , Ahmed Galal، نويسنده , , Sven Hausner، نويسنده , , Judith F Rubinson، نويسنده , , George C Russell، نويسنده , , Hans Zimmer، نويسنده , , George P. Kreishman، نويسنده ,
Abstract :
The deviations at high concentrations (>10 −5 M) in the calibration curves for the determination of catechol in catechol/ascorbic acid mixtures by flow injection analysis using series dual-band poly(3-methylthiophene)-coated electrodes has been re-examined. The cyclic voltammetry (at pH≅7.4) of catechol/ascorbate and catechol/urate mixtures and NMR measurements show these deviations are the result of the simultaneous homogeneous catalytic reaction of dehydrocatechol with ascorbate.
Keywords :
Ascorbic acid , Micro electrodes , Flow injection analysis , Dual band electrodes , Polymer electrodes , Catechol , Uric acid , Synergetic effects
