Studies of the electrochemical behavior of epinephrine at a homocysteine self-assembled electrode.
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 2.1x10(-2) cms(-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.
Zhang
Hui-Min
HM
Department of Chemistry, Peking University, Beijing 100871, People's Republic of China.
Zhou
Xian-Liang
XL
Hui
Ru-Tai
RT
Li
Nan-Qiang
NQ
Liu
De-Pei
DP