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Science 27 February 1981:
Vol. 211. no. 4485, pp. 944 - 947
DOI: 10.1126/science.6258225
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Articles

Science, Vol 211, Issue 4485, 944-947
Copyright © 1981 by American Association for the Advancement of Science

articles

Electrochemical reduction of horse heart ferricytochrome c at chemically derivatized electrodes

NS Lewis and MS Wrighton

Platinum or gold electrodes derivatized with an N,N'-dialkyl-4,4'-bipyridinium reagent can be used to reduce horse heart ferricytochrome c, whereas reduction doses does not occur at the "naked" electrodes. From 3 to 17.7 millimoles per liter, the reduction of ferricytochrome c is mass transport-limited at electrode potentials more negative than about -0.6 volt against a saturated calomel reference electrode. Data for the photoreduction of ferricytochrome c at derivatized p-type silicon photocathodes show directly that the rate of reduction is mass transport-limited. Use of derivatized electrodes may allow convenient manipulation and analysis of biological molecules that do not ordinarily respond at conventional electrodes.


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