مشخصات پژوهش

عنوان	Electrocatalytic Determination of Ascorbic Acid at Chemically Modified Carbon Paste Electrode with 2, 7-bis (Ferrocenyl ethynyl) Fluoren-9-one
نوع پژوهش	مقاله چاپ شده
کلیدواژه‌ها	2,7-bis (ferrocenyl ethynyl) fluoren-9-one, ascorbic acid, electrocatalysis, cyclic voltammetry, differential pulse voltammetry, chronoamperometry, Modified carbon paste electrode
چکیده	Cyclic voltammetry, differential pulse voltammetry and double potential step chronoamperometry were used to investigate the electrochemical behavior of ascorbic acid (AA) at a chemically modified electrode prepared by incorporating 2,7-bis (ferrocenyl ethynyl) fluoren-9-one (2, 7-BFEFO) into carbon paste matrix. Under the optimized conditions (pH 7.00), the modified electrode showed high electrocatalytic activity toward AA oxidation; the overpotential for the oxidation of AA was decreased by more than 200 mV and the corresponding peak current increased significantly. In fact, the Fc/ Fc+ redox couple acts as a suitable mediator for indirect oxidation of AA. The diffusion coefficient (D =8.65×10-6 cm2 s-1), and the kinetic parameters such as electron transfer coefficient, (α = 0.47) and the catalytic reaction rate constant, (k=8.55×103 M-1 s-1 ) were also determined using electrochemical approaches. The voltammetric response of the modified electrode was linear against the concentration of AA in the ranges of 5×10-5 M-2.65×10-3 M and 9×10-6 M-3.5×10-3 M with cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods, respectively. The detection limits (2σ) were determined as 1.8×10-5 M and 4.2×10-6 M by CV and DPV methods, respectively. This method was also used for determination of AA in some pharmaceutical preparations.
پژوهشگران	هادی بیت الهی (نفر سوم)، رضا اوجانی (نفر دوم)، جهانبخش رئوف (نفر اول)