The transference of triplet state excitation energy. II. Kinetics of formation and decay of triplet state species |
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| Authors: | B Rabinovitch |
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| Affiliation: | 1. National Centre for Cell Science, 411007 Pune, India;2. Jagadis Bose National Science Talent Search (JBNSTS), Kolkata 700107 India;3. Department of Infectious Diseases and Microbiology, University of Lübeck, Lübeck 23538, Germany;4. Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal;5. ICVS/3B’s – PT Government Associate Laboratory, Braga/Guimarães, Portugal;6. Trident Academy of Creative Technology, Bhubaneswar, Odisha 751024, India;7. INSERM U1124, Université Paris Descartes, 75006 Paris, France;8. Centre de Recherche du CHU de Québec - Université Laval, Québec, Canada |
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| Abstract: | An analysis of the kinetics of three possible bimolecular quenching processes affecting the rates of formation and decay of the excited triplet state species in tyrosine and tryptophan has been carried out. For each possibility both the rate of formation and the rate of decay were considered, and the effects of concentration of amino acid and intensity of excitation source examined. In every case, a closed form equation was obtained and compared to what must be considered preliminary data of three possibilities, and in the light of the limited data only one, namely T1 + S0 → 2S0, could be considered to conform to the observations. In the case of tryptophan, estimates of several rate constants were possible and the probability of the T1 → S1 transition was considered negligible. For tyrosine, these estimates were not possible for lack of sufficiently accurate data, but the T1 → S1 transition here was demonstrated to be significant. |
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