The pulse radiolysis method has been used to investigate the initial radiolysis products of phenylalanine, p-hydroxyphenylpropionic acid, tyrosine, and polytyrosine in aqueous solutions. The transient spectra indicate that OH forms addition products with all four compounds and also attacks tyrosine, polytyrosine, and p-hydroxyphenylpropionic acid at the ionized phenolic OH group, giving phenoxyl derivatives. Evidence was obtained also for the formation of phenoxyl by water elimination in near-neutral solutions of tyrosine and p-hydroxyphenylpropionic acid and of H-atom addition products in acidic solutions. The rate constants for the reactions with${\rm e}_{{\rm aq}}^{-}$ and OH are reported and compared with available literature values.

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