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Signatures of pancake bonding in hydrated eumelanin
Physical Chemistry Chemical Physics, 2023 Pancake bonding phenomenology explains the long-term inconsistency between electron paramagnetic resonance, muon spin relaxation and conductivity data for biopigment eumelanin.
P. A. Abramov +3 more
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Mechanism of UVA Degradation of Synthetic Eumelanin
Biomacromolecules, 2019 Eumelanin is a ubiquitous natural pigment that has a broad absorption across ultraviolet (UV, 100-400 nm) and visible wavelengths (400-700 nm) and can protect against radiation. Synthetic eumelanin with properties similar to natural eumelanin has been made using dopamine or dihydroxyindole.
Weiyao Li +10 more
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The physical and chemical properties of eumelanin
Pigment Cell & Melanoma Research, 2006SummaryIn this article, we review the current state of knowledge concerning the physical and chemical properties of the eumelanin pigment. We examine properties related to its photoprotective functionality, and draw the crucial link between fundamental molecular structure and observable macroscopic behaviour.
Paul Meredith, Tadeusz Sarna
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Eumelanin electrodes in buffered aqueous media at different pH values [PDF]
Electrochimica Acta, 2020 Eumelanin, a quinone-based biomacromolecule, is the most common form of the biopigment melanin in the human body. Eumelanin has attracted great interest due to its physicochemical properties, such as metal-ion chelation, free radical scavenging ...
Abdelaziz Gouda +2 more
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In Situ Formation of Dendrites in Eumelanin Thin Films between Gold Electrodes
Advanced Functional Materials, 2013 Eumelanin is a ubiquitous pigment in the human body, animals, and plants, with potential for bioelectronic applications because of its unique set of physical and chemical properties, including strong UV-vis absorption, mixed ionic/electronic conduction ...
Luis Cárdenas +2 more
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Determination of eumelanin in human urine
Pigment Cell Research, 2006SummaryNormal and malignant melanocytes produce melanins and melanin‐related metabolites, most of which are retained in the cells but some are secreted into the blood and then excreted in the urine. In this study, we developed a method to measure levels of eumelanin in urine samples and evaluated its clinical significance in comparison with the melanin‐
Kazumasa, Wakamatsu +4 more
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Fluorescence spectroscopy of eumelanins
IEEE Journal of Quantum Electronics, 1984The fluorescence spectra from different forms of melanin, excited by an argon-ion laser at 488 nm wavelength were measured. The fluorescence intensity and maxima were found to be dependent on the melanin concentration. The location of the fluorescence maxima depends on the type of melanin and its environment.
S. Kozikowski, L. Wolfram, R. Alfano
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Eumelanin for nature‐inspired UV‐absorption enhancement of plastics
Polymer International, 2019 In the human body, the black-brown biopigment eumelanin blocks the harmful ultraviolet (UV) radiation. In the plastics industry, additives are often added to polymers to increase their UV-absorption properties.
Eduardo Di Mauro +2 more
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Vibrational spectroscopy of synthetic and natural eumelanin
Polymer International, 2016 We report vibrational spectra of two types of eumelanin samples: a synthetic one, produced by oxidation of tyrosine with hydrogen peroxide, and a natural one, extracted fromSepia officinalis,with the aim of pointing out the differences between the main ...
G Perna, Maria Lasalvia, V Capozzi
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Reexamination of the structure of eumelanin
Biochimica et Biophysica Acta (BBA) - General Subjects, 1986The generally accepted concept that the black melanin eumelanin is made mostly from 5,6-dihydroxyindole but not from 5,6-dihydroxyindole-2-carboxylic acid (DHIC) was reexamined by comparison of synthetic and natural eumelanins. The analytical methods used were elemental analysis and determination of the carboxyl group by acid treatment to yield CO2 and
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