FLUORESCENCE OF TRYPTOPHAN IN KERATIN

The excitation and emission spectra have been determined for the fluorescence from trypto‐phan residues in dry keratin. The fluorescence decay was also measured and shown to be a single exponential with a rather long lifetime of 6.9 ns. It is suggested that the emission takes place from a state formed by interaction between the 1La state of the tryptophan residues and neighbouring polar or polarizable groups in the protein.

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