Spectral and kinetic evidences are provided for the formation of singlet oxygen photosensitized by aromatic amino acids in air-saturated water. Irradiation of these solutions at 266 nm induces infrared luminescence with a time-resolved spectrum peaking at 1270 nm and a lifetime characteristic of singlet oxygen. In the cases of tryptophan, tyrosine and phenylalanine, the radiative lifetime are 3.3±0.1μs, 3.9±0.1μs and 3.7±0.1μs, respectively.
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Shimizu et al. (1997) studied this question.
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