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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >NMR and dielectric studies of hydrated collagen and elastin: Evidence for a delocalized secondary relaxation
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NMR and dielectric studies of hydrated collagen and elastin: Evidence for a delocalized secondary relaxation

机译：水合胶原和弹性蛋白的NMR和介电研究：离域二次弛豫的证据

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摘要

Using a combination of dielectric spectroscopy and solid-state deuteron NMR, the hydration water dynamics of connective tissue proteins is studied at sub-ambient temperatures. In this range, the water dynamics follows an Arrhenius law. A scaling analysis of dielectric losses, 'two-phase' NMR spectra, and spin-lattice relaxation times consistently yield evidence for a Gaussian distribution of energy barriers. With the dielectric data as input, random-walk simulations of a large-angle, water reorientation provide an approximate description of stimulated-echo data on hydrated elastin. This secondary process is quasi-isotropic and delocalized. The delocalization is inferred from previous NMR diffusometry experiments. It is emphasized that the phenomenology of this process is shared by many non-aqueous binary glasses in which the constituent components exhibit a sufficient dynamical contrast.
机译：使用介电谱和固态氘核NMR的组合，研究了在低于室温的温度下结缔组织蛋白的水合水动力学。在此范围内，水动力学遵循阿伦尼乌斯定律。介电损耗，“两相” NMR光谱和自旋晶格弛豫时间的定标分析始终为能垒的高斯分布提供证据。以介电数据为输入，大角度水取向的随机游走模拟提供了有关水合弹性蛋白的回波数据的近似描述。该次级过程是准各向同性的和离域的。从以前的NMR衍射实验可以推断出离域。要强调的是，这一过程的现象学被许多非水的二元玻璃所共有，其中成分的成分表现出足够的动态对比。

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