Electrocatalytic response of norepinephrine at a thiolactic acid self-assembled gold electrode.
The thiolactic acid (TLA) self-assembled monolayer modified gold electrode (TLA/Au) is demonstrated to catalyze the electrochemical response of norepinephrine (NE) by cyclic voltammetry. A pair of well-defined redox waves were obtained and the calculated standard rate constant (k(s)) is 5.11x10(-3) cm s(-1) at the self-assembled electrode. The electrode reaction is a pseudo-reversible process. The peak current and the concentration of NE are a linear relationship in the range of 4.0x10(-5)-2.0x10(-3) mol l(-1). The detection limit is 2.0x10(-6) mol l(-1). By ac impedance spectroscopy the apparent electron transfer rate constant (k(app)) of Fe(CN)(3-)/Fe(CN)(4-) at the TLA/Au electrode was obtained as 2.5x10(-5) cm s(-1).
Wang
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Department of Chemistry, Peking University, Beijing 100871, People's Republic of China.
Li
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