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Reaction of Hydrated Electrons with Ferricytochrome c

Norman N. Lichtin, Avigdor Shafferman and Gabriel Stein
Science
New Series, Vol. 179, No. 4074 (Feb. 16, 1973), pp. 680-682
Stable URL: http://www.jstor.org/stable/1735568
Page Count: 3
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Reaction of Hydrated Electrons with Ferricytochrome c
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Abstract

The reaction of ferricytochrome c with hydrated electrons produced at pH 6.8 by radiolysis with electron pulses lasting 50 to 1000 nanoseconds has a specific rate constant of 5.5 × 10$^{10}$ liter mole$^{-1}$ sec$^{-1}$ for the formation of the primary adduct. By using appropriate wavelengths, another fast, consecutive process was demonstrated, with the pure first order rate constant 1.0 × 10$^{5}$ sec$^{-1}$. Its characteristics agree with it being an intramolecular process within the enzyme. Approximately 50 percent of all electrons which add to ferricytochrome c end in forming ferrocytochrome c.

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