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  • Title: Pulse radiolytic measurement of redox potentials: the tyrosine and tryptophan radicals.
    Author: DeFelippis MR, Murthy CP, Faraggi M, Klapper MH.
    Journal: Biochemistry; 1989 May 30; 28(11):4847-53. PubMed ID: 2765513.
    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.
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