Electrocatalytic Characteristics of a 1-[4-(Ferrocenyl ethynyl)phenyl]-1-ethanone Modified Carbon-Paste Electrode in the Oxidation of Ascorbic Acid

Abstract

A carbon-paste electrode spiked with 1-[4-(ferrocenyl ethynyl)phenyl]-1-ethanone was constructed by the incorporation of 1-[4-(ferrocenyl ethynyl)phenyl]-1-ethanone in a graphite powder silicon oil matrix. It shown by cyclic voltammetry and double potential-step chronoamperometry, which this ferrocene derivative modified a carbon-paste electrode, can catalyze the ascorbic acid oxidation in an aqueous buffered solution. It has been found that under the optimum conditions (pH 7.00), the oxidation of ascorbic acid at the surface of this carbon paste modified electrode occurs at a potential of about 260 mV less positive than that of an unmodified carbon-paste electrode. The catalytic oxidation peak current was linearly dependent on the ascorbic acid concentration, and a linear calibration curve was obtained in the range of 6 × 10 -5 M -7 × 10 -3 M of ascorbic acid with a correlation coefficient of 0.9997. The detection limit (2σ) was determined to be 6.3 × 10 -5 M. This method was also used for the determination of ascorbic acid in some pharmaceutical samples, such as effervescent tablets, ampoules and multivitamin syrup, by using a standard addition method. The reliability of the method was established by a parallel determination against the official method.

Electrocatalytic Determination of Ascorbic Acid at the Surface of 2,7‐Bis(ferrocenyl ethyl)fluoren‐9‐one Modified Carbon Paste Electrode

“…As can be seen in this figure, the cathodic current would increase with increasing the scan rate, because in short timescale experiments, there is no enough time for the catalytic reaction to take place completely. It can be noted from Figure 5A that, with an increase in the scan rate, the peak potential for the catalytic oxidation of ascorbic acid shifts to the more positive potentials, suggesting a kinetic limitation in the reaction between the redox sites of 2,7-BFEFMCPE and ascorbic acid [17,24,39]. However, the oxidation current for ascorbic acid increased linearly with the square Carbon paste electrode…”

Synthesis and electrochemical study of some novel alkynylferrocene derivatives

“…Electrochemical techniques have been particularly investigated for determining the concentration of biologically and clinically important compounds. In electrochemical methods an applied potential is used between reference and working electrodes for oxidation or reduction of an electroactive species, for example ferrocene derivatives [17][18][19][20][21][22] .…”

Electrochemical Behavior of Ascorbic Acid at a 2,2'-[3,6-Dioxa-1,8-octanediylbis(nitriloethylidyne)]-bis-hydroquinone Carbon Paste Electrode

“…4,5 Therefore, some chemically modified electrodes with various active mediators immobilized at the electrode surface have been used for the catalysis of electrooxidation of AA. [6][7][8][9][10] These include a glassy carbon electrode (GCE) and a carbon paste electrode with complexes and organic compounds, such as cobalt hexacyanoferrate, 11 ruthenium(III) diphenyldithiocarbamate, 12 cobalt pentacyanonitrosylferrate, 13 ferrocene with b-cyclodextrin, 14 ferrocenecarboxylic acid, ferroceneacetic acid, ferrocenemetal, 15,16 poly(malachite green), 17 benzoquinone, 18 norepinephrine, 19 Ni[Me2(CH3CO)], 14 tetraenoN4 complex, 20 and aniline. 21 Carbon paste electrode (CPE) is one of the convenient conductive matrixes that allow one to prepare the chemically modified electrodes (CMEs) by simple mixing of graphite/binder paste and modifier.…”