✦ LIBER ✦

Excited-state reaction and the origin of the biexponential fluorescence decay of tryptophan zwitterion

✍ Scribed by K.J. Willis; A.G. Szabo; D.T. Kracjarski

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 262 KB
Volume: 182
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(91)90134-u

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✦ Synopsis

The fluorescence decay of tryptophan zwitterion in Hz0 and D20 solution was determined over the entire emission spectrum. The biexponential decay kinetics show features which are consistent with the occurrence of an excited-state reaction. This observation is not predicted by models of tryptophan photophysics based on ground-state conformation heterogeneity. We speculate that the excited-state reaction involves alteration of the rotamer populations in response to the change in the state dipole which occurs upon excitation.

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