Citation: Yuan Zhen Zhou, Hui Wang, She Ying Dong, An Xiang Tian, Zhi Xian He, Bin Chen. Direct electrochemistry and electrocatalysis of myoglobin in dodecyltrimethylammonium bromide film modified carbon ceramic electrode[J]. Chinese Chemical Letters, ;2011, 22(4): 465-468. doi: 10.1016/j.cclet.2010.11.012 shu

Direct electrochemistry and electrocatalysis of myoglobin in dodecyltrimethylammonium bromide film modified carbon ceramic electrode

School of Science, Xi'an University of Architecture and Technology, Xi'an 710055, China

Received Date: 23 July 2010

Fund Project: This work was supported by the Shaanxi Provincial Natural Science Foundation for Young Scientist (No. 2009JQ2011), the Shaanxi Provincial Education Department Foundation (No. 08JK322), the Youth Science and Technology Foundation of Xi'an University of Architecture and Technology (No. QN0620) and Youth Scientist Foundation of Xi'an University of Architecture and Technology (No. RC0942).

Direct electrochemistry and electrocatalysis of myoglobin (Mb) were studied with Mb immobilized on dodecyltrimethylammonium bromide (DTAB) film modified carbon ceramic (CC) electrode. Cyclic voltammetry showed a pair of well-defined and nearly reversible redox peaks of Mb (Fe^Ⅱ/Fe^Ⅲ) at about -0.3 V vs. SCE (pH=6.98). The currents of the redox peak were linear to scan rate, and rate constant (Ks) was estimated to be 3.03 s^-1. The formal potential (E^°') of Mb in the DTAB/CC electrodes shifted linearly with pH with a slope of -36.44 mV/pH, implying that the electron transfer between DTAB and CC electrodes is accompanied by proton transportation. The immobilized Mb exhibited excellent electrocatalytic response to the reduction of hydrogen peroxide (H₂O₂).
- Electrocatalysis,
- Direct electron transfer,
- DTAB,
- H₂O₂,
- Myoglobin
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