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Enhanced Voltammetric Detection of Epinephrine at a Carbon Nanotube/Nafion Composite Electrode in the Presence of Ascorbic Acid

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Voltammetry has been shown to be especially useful to detect epinephrine in the nervous or pharmacological system. A major limitation of this strategy, however, is the interference of ascorbic acid, which is usually present in high concentration and can be oxidized at a potential close to that of epinephrine. Furthermore, the sensitivity is rather low. In order to get selective and sensitive measurements of epinephrine in the presence of ascorbic acid via electrochemical methods, we fabricated the CNT/Nafion composite electrode and investigated the electrocatalytic activity of the composite electrode toward epinephrine in this paper. Due to the high electrocatalytic activity of CNTs and the selective penetration of Nafion membrane, the composite electrode was found to enhance the oxidation peak current and lower the overpotential of epinephrine. In the complex sample medium, permeation of the positive charged epinephrine into the electrode surface was significantly facilitated, while that of neutral ascorbic acid (AA) moiety in the acidic solution was largely blocked. As a result, interference from the coexisted ascorbic acid was excluded at the CNT/Nafion composite electrode. Differential pulse voltammetry was successfully utilized for the determination of epinephrine in the presence of a large quantity of ascorbic acid. In the presence of 4.0 mM ascorbic acid, the anodic currents of epinephrine are linearly dependent on the concentrations of epinephrine in the range of 0.2 to 20 M with the detection limit of 0.04 M. The feasibility of the composite electrode for determination of epinephrine in adrenaline hydrochloride injection has also been demonstrated.
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Document Type: Research Article

Publication date: 2009-11-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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