Journal
TALANTA
Volume 56, Issue 6, Pages 1081-1088Publisher
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DOI: 10.1016/S0039-9140(01)00642-7
Keywords
epinephrine; self-assembled electrode; cyclic voltammetry; FT-IR spectroscopy
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The self-assembled electrode with the homocysteine monolayer (Hcy/Au) has been characterized by infrared spectroscopy and ac impedance spectroscopy in electrolyte. The Hcy/Au electrode is demonstrated to promote the electrochemical response of epinephrine (E) by cyclic voltammetry. A pair of well-defined redox waves was obtained and the calculated standard rate constant (k(s)) is 2.1 x 10(-2) cm s(-1) at the self-assembled electrode. The reduction peak of E can be used to determine the concentration of E in presence of ascorbic acid (AA) owing to the Hcy/Au also promoting the electrochemical oxidation of AA. (C) 2002 Elsevier Science B.V. All rights reserved.
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