Results 251 to 260 of about 12,369 (282)

Eumelanin-like Poly(levodopa) Nanoscavengers for Inflammation Disease Therapy.

Biomacromolecules
In the current years, polydopamine nanoparticles (PDA NPs) have been extensively investigated as an eumelanin mimic. However, unlike natural eumelanin, PDA NPs contain no 5,6-dihydroxyindole-2-carboxylic acid (DHICA)-derived units and may be limited in ...
Xianheng Wang, Jianhua Zhang, Lei Yang, Tianyou Wang, Gaigai Duan, Zhipeng Gu, Yiwen Li   +6 more
semanticscholar   +1 more source

Robust and Flexible Rubber Composite with High Photothermal Properties Achieved by In Situ ZDMA Assisted Dispersion of Eumelanin and its Hydrophobic Photothermal Application.

Small
Eumelanin, a natural, biocompatible, and biodegradable photothermal agent derived from biomass, has attracted increasingly considerable attention due to its outstanding photothermal conversion efficiency.
Luji Li, Zihao Lin, Zehua He, Zexian Su, Lihua Fu, Chuanhui Xu   +5 more
semanticscholar   +1 more source

Natural eumelanin and its derivatives as multifunctional materials for bio-inspired applications: a review.

Biomacromolecules, 2019
Natural melanin is a ubiquitous material that plays critical biofunctional roles in different living organisms. Scientists have dedicated significant efforts to elucidate the biofunctional roles of melanin since its discovery.
Wanjie Xie, Esfandiar Pakdel, Yujia Liang, Young Jo Kim, Dan Liu, Lu Sun, Xungai Wang   +6 more
semanticscholar   +1 more source

Reexamination of the structure of eumelanin

Biochimica et Biophysica Acta (BBA) - General Subjects, 1986
The 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
openaire   +2 more sources

5,6‐Dihydroxyindole Chemistry: Unexplored Opportunities Beyond Eumelanin

European Journal of Organic Chemistry, 2011
Abstract5,6‐Dihydroxyindoles, the key building blocks of eumelanin biopolymers, hold promise as versatile molecular systems for the design and development of new functional aromatic scaffolds, biomimetic polymers, and nanomaterials with tailored optical and electronic properties.
D'ISCHIA, MARCO, NAPOLITANO, ALESSANDRA, PEZZELLA, ALESSANDRO   +2 more
openaire   +2 more sources

Elucidating the Photoprotection Mechanism of Eumelanin Monomers

The Journal of Physical Chemistry B, 2017
Eumelanin, the functional polymer in human skin, forms a heterogeneous layered structure intrinsic to its broadband monotonic spectra. The inherent structural heterogeneity of eumelanin makes the photoprocesses very complex and diverse in nature. Due to this diversity, a complete mechanistic picture of these photoprocesses, essential to understanding ...
Paulami Ghosh, Debashree Ghosh
openaire   +2 more sources

Energetics of Radical Formation in Eumelanin Building Blocks: Implications for Understanding Photoprotection Mechanisms in Eumelanin

The Journal of Physical Chemistry A, 2016
The supramolecular structure of melanin pigments is characterized by a high concentration of radical species. Therefore, the energetics of the radical formation in melanin building blocks is key for understanding the structure and the electronic properties of the pigments at the molecular level. Nevertheless, the radical energetics of even the simplest
Filipe Agapito, Benedito J. Costa Cabral
openaire   +2 more sources

Hydration-dependent infrared study of eumelanin

2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 2021
Here we report our study of the mid-infrared absorption spectra of a melanin thin film performed with hydration level variation. We demonstrate the direct signatures of the proposed earlier comproportionation reaction induced by continuous hydration along with the fingerprints of three water sub-phases in hydrated melanin.
Zakhar V. Bedran, Sergei S. Zhukov, Pavel A. Abramov, Ilya O. Tyurenkov, Boris P. Gorshunov, A. Bernard Mostert, Konstantin A. Motovilov   +6 more
openaire   +1 more source

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, Zhao Wang, Ming Xiao, Toshikazu Miyoshi, Xiaozhou Yang, Ziying Hu, Cheng Liu, Steven S. C. Chuang, Matthew D. Shawkey, Nathan C. Gianneschi, Ali Dhinojwala   +10 more
openaire   +2 more sources

Eumelanin kinetics and sheet structure

Applied Physics Letters, 2012
Melanins are common pigments with a non-repeating primary structure that is generally accepted to be composed of dihydroxyindoles. However, despite intensive research the secondary structure defining the minimum functional unit (protomolecule) remains elusive.
Sutter, J. U., Bidlakova, T., Karolin, J., Birch, D. J. S.   +3 more
openaire   +2 more sources