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Losi A, Viappiani C, Crippa PR. Quenching of the excited states of 8-methoxypsoralen by synthetic Eumelanin. J Fluoresc. 1993;3(3):191-4doi: 10.1007/BF00862741.
Losi, A., Viappiani, C., & Crippa, P. R. (1993). Quenching of the excited states of 8-methoxypsoralen by synthetic Eumelanin. Journal of fluorescence, 3(3), 191-4. https://doi.org/10.1007/BF00862741
Losi, A, et al. "Quenching of the excited states of 8-methoxypsoralen by synthetic Eumelanin." Journal of fluorescence vol. 3,3 (1993): 191-4. doi: https://doi.org/10.1007/BF00862741
Losi A, Viappiani C, Crippa PR. Quenching of the excited states of 8-methoxypsoralen by synthetic Eumelanin. J Fluoresc. 1993 Sep;3(3):191-4. doi: 10.1007/BF00862741. PMID: 24234832.
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J Fluoresc. 1993 Sep;3(3):191-4. doi: 10.1007/BF00862741.

Quenching of the excited states of 8-methoxypsoralen by synthetic Eumelanin.

Journal of fluorescence

A Losi, C Viappiani, P R Crippa

Affiliations

  1. Department of Physics, University of Parma, Viale delle Scienze, 43100, Parma, Italy.

PMID: 24234832 DOI: 10.1007/BF00862741

Abstract

The interaction of 8-methoxypsoralen (8-MOP) with synthetic eumelanin was investigated using static and time-resolved fluoresence and pulsed photoacoustic calorimetry. Spectroscopic data indicate the absence of interaction in the ground state, whereas the singlet excited state of 8-MOP is quenched by the pigment; the average fluorescence lifetimes are independent of the melanin concentration, thus indicating a static mechanism. Photoacoustic data show that the quenching process involves an increased intersystem crossing probability, which is almost unaffected by the presence of oxygen, as expected for a molecule essentially acting as a type I photosensitizing agent.

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