Abstract
Spectroscopic studies of pheomelanin and its constituents have been sparse. These data present what is by far the most complete description of the fluorescence characteristics of synthetic pheomelanin. Emission spectra between 260 and 600 nm were acquired for excitation wavelengths between 250 and 500 nm at 1βnm intervals. A quantum yield map is also presented, correcting the fluorescence intensities for differences in species concentration and molar absorptivity. These fluorescence features exhibit interesting similarities and differences to eumelanin, and these data are interpreted with respect to possible chemical structures. Overall, these data suggest that pheomelanin oligomers may be more tightly coupled than those of eumelanin. Finally, the quantum yield is shown to be on the order of 10^β4^ and exhibit a complex dependence on excitation energy, varying by a factor of 4 across the energies employed here. Β© 2006 Wiley Periodicals, Inc. Biopolymers 82: 631β637, 2006
This article was originally published online as an accepted preprint. The βPublished Onlineβ date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at [email protected]