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- W2036699151 abstract "Laser flash photolysis of aqueous tryptophan at 265 nm generates the neutral radical product of indole ring N-H bond photolysis (lambda/sub max/ 510 nm, 1800 M/sup -1/ cm/sup -1/; 330 nm, 3100 M/sup -1/ cm/sup -1/), the triplet state (lambda/sub max/ 460 nm), and the hydrated electron as initial products. The photoionization quantum yields for tryptophan, 1-methyltryptophan, tyrosine, and glycine-tryptophan peptides have been determined using ferrocyanide as the reference system. The electron and aromatic radical decay by a previously unreported first-order back reaction of 0.80-..mu..sec half-time, leading to residual yields of the separated products after several microseconds significantly smaller than the photoionization yield. The kinetics results are consistent with the formation of a loose complex between the hydrated electron and the radical in which recombination competes with separation. The implications of this process for tryptophyl residue destruction in proteins are considered. A comparable first-order electron decay stage was observed with tryptophan derivatives, tyrosine, I/sup -/, and Fe(CN)/sub 6//sup 4 -/." @default.
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- W2036699151 date "1975-12-01" @default.
- W2036699151 modified "2023-10-14" @default.
- W2036699151 title "Laser flash photolysis of aqueous tryptophan" @default.
- W2036699151 doi "https://doi.org/10.1021/j100592a002" @default.
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