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Unravelling eumelanin structure
2009Elucidation of the fundamental structural features and supramolecular organization of eumelanins is an essential prerequisite for an understanding of their unique physicochemical properties and biological role beyond the mere provision of a pigment.
D'ISCHIA, MARCO +3 more
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Spectrophotometric Assay of Eumelanin in Tissue Samples
Analytical Biochemistry, 1993Most of the natural melanin pigments consist of not only indolic eumelanin but also sulfur-containing pheomelanin. Previous methods for spectrophotometric assay of melanins use solubilization in alkaline media; a major disadvantage of these procedures is that they do not distinguish between eumelanin and pheomelanin.
S, Ito, K, Wakamatsu, H, Ozeki
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Understanding the Role of Aggregation in the Broad Absorption Bands of Eumelanin.
ACS Nano, 2018In this work, we investigate the relationship between the complex hierarchical assembly structure of eumelanin, its characteristic broad absorption band, and the highly unusual nonlinear dynamics revealed by pump-probe or transient absorption microscopy.
Kuk-Youn Ju, M. Fischer, W. Warren
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A Hierarchical Self-Assembly of Eumelanin
The Journal of Physical Chemistry B, 2000Atomic force microscopy is used to examine the structure of a natural eumelanin isolated from the ink sacs of cuttlefish (Sepia officinalis). The experimental data presented clearly show that the 100−200 nm spherical eumelanin particles imaged previously by SEM are not a fundamental structural unit. While these spherical particles are stable structures,
Christine M. R. Clancy +3 more
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1988
It is generally accepted that black and brown skin is well-protected against sunlight-induced inflammation and degeneration. In contrast the fair skin of certain Caucasian subjects and especially the skin of red-haired people is highly sensitive to the damaging effects of sunlight.
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It is generally accepted that black and brown skin is well-protected against sunlight-induced inflammation and degeneration. In contrast the fair skin of certain Caucasian subjects and especially the skin of red-haired people is highly sensitive to the damaging effects of sunlight.
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Indole-5,6-quinones display hallmark properties of eumelanin
Nature Chemistry, 2023Xueqing Wang +8 more
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Ultrafast Nonradiative Relaxation Dynamics of Eumelanin
The Journal of Physical Chemistry B, 2001Degenerate pump−probe femtosecond spectroscopy is used to examine the primary photodynamics of eumelanin from Sepia officinalis following UV-A excitation. Exciting and probing at 320, 350, and 380 nm produces a transient absorption that rises within the instrument response and decays with a lifetime less than approximately 50 fs.
J. Brian Nofsinger +2 more
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Fluorinated Polyimide/Sepia Eumelanin Nanocomposites for Aerospace Applications
ACS Applied Polymer Materials, 2023Qing Li +5 more
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Melanins are a class of bio-macromolecules that are found throughout the biosphere. They fulfill various functions in human beings, which makes them a long studied substance in medicine and biology. Furthermore they possess a set of rare and special physico-chemical properties which include featureless broad band absorption in the UV-Vis spectrum and ...
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Speculations on the molecular structure of eumelanin
International Journal of Cosmetic Science, 2009SynopsisEumelanin is the polymeric black pigment commonly found in hair and skin. Its chemical intractability, to all but vigorous oxidizing agents, has hindered satisfactory understanding of its molecular structure. It is well‐established that the immediate precursor to polymerization, indole‐5,6‐quinone (IQ), is biosynthesized from the amino acid ...
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