FLASH PHOTOLYSIS STUDIES OF PROTEINS AND INDOLE DERIVATIVES IN SOLUTION

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Abstract
Abstract— Transients obtained upon flash photolysis of a number of proteins in aqueous solution appear to derive from electron ejection from tryptophyl residue side chains. These decay by a second order process. Oxygen is an effective quencher for the protein transients but is less so for the flash‐induced signals obtained from simple indole derivatives. Experiments using other quenchers indicate that the signals are not due to an indole triplet state, but that the triplet state may be a precursor of the flash‐induced metastabie species. Compounds which bind to the active site of chymotrypsin were found to exert only non‐specific effects on the flash‐induced signals.