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Biochemistry. 1989 May 30;28(11):4847-53.

Pulse radiolytic measurement of redox potentials: the tyrosine and tryptophan radicals.

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  • 1Department of Chemistry, Ohio State University, Columbus 43210.

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.

PMID:
2765513
[PubMed - indexed for MEDLINE]
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