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Studies Of The Electrochemical Behavior Of Epinephrine Immobilized On Self-Assembled Monolayers

Lu Xiaoquan, Zuo Guofang, Chen Jing, Zhang Yan, Liu Xiuhui, Liu Hongde, Zhang Limin

Pure and mixed 3-mercaptopropionic acid monolayers were prepared on gold electrode surface with the intention of studying the electrochemical behaviors of epinephrine (EP). The self-assembled monolayers (SAMs) were characterised by electrochemical reductive desorption of the thiolate from the gold surface. The cyclic voltammetry was used to investigate monolayers which reveals that the 2e- transfer of EP at the electrode by one step and the electron transfer coefficient ks is calculated as 0.185 cm s-1. The experiments have also shown that the proportions of the two compounds yield modified electrodes exhibiting corresponding electrochemical behaviors for the EP. With increased the proportion of mercaptopropionic acid on electrodes, the electrochemical respondes of EP corresponding increased. The reaction mechanism of EP immobilized on SAMs were also discussed.