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http://dx.doi.org/10.5012/bkcs.2007.28.12.2271

Reaction between Gas-phase Hydrogen Atom and Chemisorbed Bromine Atoms on a Silicon(001)-(2X1) Surface  

Park, Jong-Keun (Department of Chemistry Education, Chonnam National University)
Ree, Jong-Baik (Department of Chemistry Education, Chonnam National University)
Lee, Sang-Kwon (Department of Chemistry Education, Chonnam National University)
Kim, Yoo-Hang (Department of Chemistry and Center for Chemical Dynamics, Inha University)
Publication Information
Bulletin of the Korean Chemical Society / v.28, no.12, 2007 , pp. 2271-2278 More about this Journal
Abstract
Electron transfer of a redox protein at a bare gold electrode is too slow to observe the redox peaks. A novel Nafion-riboflavin functional membrane was constructed during this study and electron transfer of cytochrome c, superoxide dismutase, and hemoglobin were carried out on the functional membrane-modified gold electrode with good stability and repeatability. The immobilized protein-modified electrodes showed quasireversible electrochemical redox behaviors with formal potentials of 0.150, 0.175, and 0.202 V versus Ag/AgCl for the cytochrome c, superoxide dismutase and hemoglobin, respectively. Whole experiment was carried out in the 50 mM MOPS buffer solution with pH 6.0 at 25 oC. For the immobilized protein, the cathodic transfer coefficients were 0.67, 0.68 and 0.67 and electron transfer-rate constants were evaluated to be 2.25, 2.23 and 2.5 s?1, respectively. Hydrogen peroxide concentration was measured by the peroxidase activity of hemoglobin and our experiment revealed that the enzyme was fully functional while immobilized on the Nafion-riboflavin membrane.
Keywords
Collision-induced; Hydrogen; Chemisorbed bromine; Silicon;
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