Pulse radiolytic measurement of redox potentials: the tyrosine and tryptophan radicals
- 1 May 1989
- journal article
- research article
- Published by American Chemical Society (ACS) in Biochemistry
- Vol. 28 (11) , 4847-4853
- https://doi.org/10.1021/bi00437a049
Abstract
With the technique of pulse radiolysis we have measured the redox midpoint potentials of the tryptophan side chain neutral indolyl radical (1.05 +/- 0.01 V vs NHE, pH 7.0 and 25 degrees C) and the tyrosine side chain neutral phenoxy radical (0.94 +/- 0.01 vs NHE, pH 7.0 and 25 degrees C). These potentials were obtained by using a variety of inorganic reference compounds in both kinetic and equilibrium protocols. We compare these results with others already in the literature, and we also present data useful in establishing a pulse radiolysis redox reference scale over the range 0.42-1.28 V.Keywords
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