Tryptophan has been flash photolysed in deoxygenated and air equilibrated solutions. The kinetics of the subsequent reactions of the tryptophyl radical and the hydrated electron have been elucidated. Oxygen has been found to reduce the primary photoionization yield, indicating a triplet state precursor, but no evidence has been found for a biphotonic process. Appreciable differences in the photoionization quantum yields have been found for tryptophan, alanyl tryptophan and tryptophyl alanine.
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Templer et al. (1976) studied this question.
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