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• W1967029214 abstract "We characterize for the first time the vibrational state of natural pheomelanin using Raman spectroscopy and model pigment synthesized from 5-S-cysteinyldopa. The shape of the Raman spectrum was very different from that of eumelanin. Four Raman bands were visible in the 500–2000 cm−1 wavenumber region about 500, 1150, 1490 and 2000 cm−1, which we assigned to the out-of-plane deformation and the stretching vibration of the phenyl rings, to the stretching vibration of C–N bonds or the stretching and wagging vibration of CH2, and to overtone or combination bands. Interestingly, we also show that the Raman spectrum of synthetic trichochrome F, a pigment that may be produced along with pheomelanin during pheomelanogenesis, is different from that of pheomelanin and similar to the spectrum of eumelanin. We could detect Raman signal of both eumelanin and pheomelanin in feathers and hairs where both pigments simultaneously occur without the need of isolating the pigment. This indicates that Raman spectroscopy represents a non-invasive method to detect pheomelanin and distinguish it from other pigments. This may be especially relevant to detect pheomelanin in animal skin including humans, where it has been associated with animal appearance and classification, human phototypes, prevention of skin diseases and cancer risk." @default.
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• W1967029214 date "2013-06-01" @default.
• W1967029214 modified "2023-10-18" @default.
• W1967029214 title "Vibrational characterization of pheomelanin and trichochrome F by Raman spectroscopy" @default.
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• W1967029214 doi "https://doi.org/10.1016/j.saa.2013.03.027" @default.
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