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Citation: LIANG Min-Si, BAI Yan, LIU Min, ZHENG Wen-Jie. Electrochemical Reaction of Cytochrome c at Selenocystine Self-assembled Monolayers Modified Electrodes[J]. Acta Physico-Chimica Sinica, ;2009, 25(03): 457-462. doi: 10.3866/PKU.WHXB20090311 shu

Electrochemical Reaction of Cytochrome c at Selenocystine Self-assembled Monolayers Modified Electrodes

1.
Department of Chemistry, Jinan University, Guangzhou 510632, P. R. China

Received Date: 13 November 2008
Available Online: 13 January 2009

Properties of selenocystine self-assembled monolayers at ld electrode (SeCys SAMs/Au) and hexadecyltrimethylammonium bromide (CTAB)-selenocystine self-assembled bilayers at a ld electrode (CTAB-SeCys SAMs/Au) were investigated by electrochemical and contact angle experiments. The electrochemical behavior of cytochrome c (Cyt c) on SeCys SAMs/Au and CTAB-SeCys SAMs/Au electrodes are discussed. We show that SeCys and CTAB-SeCys can promote the redox reaction of Cyt c on these electrodes. The promoting effect of CTAB-SeCys is stronger than of SeCys. We found that the current of the redox reaction of Cyt c increased when the concentration of CTAB increased from 1×10-5 to 1×10-4 mol·L-1. The maximumcurrent was observed when the concentration was close to the critical micelle concentration (cmc) of CTAB. The redox peaks of Cyt c on the CTAB-SeCys SAMs/Au electrode are 0.305 and 0.235 V, respectively and the electrochemical behavior is diffusion controlled. The promoting effect of SeCys was found to be due to a combination of SeCys and remnant group of lysine in Cyt c.
- Selenocystine,
- Cytochrome c,
- Self-assemble,
- Surfactant
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