期刊
ADVANCED MATERIALS
卷 28, 期 16, 页码 3173-3180出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201504650
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资金
- American Chemical Society [PRF51980DN17]
- Carnegie Mellon University School of Engineering
- CMU Center for Technology Transfer and Enterprise Creation
- Pennsylvania Department of Community and Economic Development, Innovation Works (Pittsburgh, PA)
- Department of Energy [DE-OE0000226]
- National Science Foundation [CHE-0130903, CHE-1039870]
- Deutsche Forschungsgemeinschaft
Eumelanins are extended heterogeneous biopolymers composed of molecular subunits with ambiguous macromolecular topology. Here, an electrochemical fingerprinting technique is described, which suggests that natural eumelanin pigments contain indole-based tetramers that are arranged into porphyrin-like domains. Spectroscopy and density functional theory calculations suggest that sodium ions undergo occupancy-dependent stepwise insertion into the core of porphyrin-like tetramers in natural eumelanins at discrete potentials.
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