A NEW FLUORESCENT PHOTOPRODUCT OF TRYPTOPHAN EVIDENCED BY LONG WAVELENGTH EXCITATION OF FLUORESCENCE |
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| Authors: | I. Tatischeff R. Klein M. Duquesne |
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| Affiliation: | Laboratoire Curie, Fondation Curíe-Institut du Radium. Laboratoire associéau CNRS n°198 11 rue P. et M. Curie, 75231 Paris Cédex 05, France |
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| Abstract: | Abstract— Besides the normal tryptophan (Trp) fluorescence in aqueous solution (emission maximum at 350 nm), a new emission, peaking around 380 nm, appears by long wavelength excitation. Its fluorescence yield (φs 0.24) is higher than that of tryptophan (φTrp= 0.13). The growth of this emission is observed under different experimental conditions, mainly under UV anaerobic irradiation. To explain this observation, the formation of a C3-hydroxylated derivative is tentatively suggested. |
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