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FLUORESCENCE OF MELANIN‐DEPENDENCE UPON EXCITATION WAVELENGTH AND CONCENTRATION
Author(s) -
Gallas James M.,
Eisner Melvin
Publication year - 1987
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1987.tb07385.x
Subject(s) - fluorescence , wavelength , excitation , spectral line , excitation wavelength , emission spectrum , chemistry , analytical chemistry (journal) , fluorescence correlation spectroscopy , signal (programming language) , materials science , optics , optoelectronics , physics , chromatography , quantum mechanics , astronomy , computer science , programming language
— An introduction to the fundamental characteristics of synthetic melanin fluorescence is presented. The particular difficulties associated with the detection and reduction of the relatively weak signal are discussed and a technique is described for correcting the fluorescence spectra for attenuation of the excitation and emission beams. Spectra are reported for the excitation wavelength range 340–400 nm and an emission range of 360–560 nm. The concentration dependence of the corrected fluorescence signal is examined and is shown to be linear. The variation of the fluorescence spectra with excitation wavelength suggests a two‐component fluorescence, for the wavelength range studied. The presence of an isosbestic point in the spectra is used to identify the fluorophores as components of a reaction equilibrium. The possible relationship of this equilibrium to that associated with the melanin photo ESR is discussed