肿胀 的
多糖
椭圆偏振法
化学
衰减全反射
氢键
化学工程
右旋糖酐
自愈水凝胶
红外光谱学
聚合物
高分子化学
材料科学
有机化学
纳米技术
分子
薄膜
工程类
作者
Michael Grossutti,John Dutcher
出处
期刊:Biomacromolecules
[American Chemical Society]
日期:2020-10-16
卷期号:21 (12): 4871-4877
被引量:11
标识
DOI:10.1021/acs.biomac.0c01098
摘要
The interaction of polysaccharides with water has a critical impact on their biological function as well as their technological applications. We performed ellipsometry experiments at different relative humidities (RH) to measure the equilibrium swelling of ultrathin films of different polysaccharides: native and modified phytoglycogen (PG) nanoparticles, dextran, and hyaluronic acid. For RH > 70%, the swelling of hydrophilic polymers with increases in RH is described by hydration forces that are characterized by an exponential decay length λ. Our analysis of the high RH swelling regime allowed us to determine λ and the bulk modulus K of the films of different polysaccharides. We also probed the high RH swelling regime using attenuated total reflection infrared (ATR-IR) spectroscopy, which allowed us to determine the degree of hydrogen bonding of the hydration water within the polysaccharide films. Combining the ellipsometry and ATR-IR spectroscopy results, we find that increases in the order of the hydrogen bond network of the hydration water, as specified by the ATR-IR parameter Rnetwork, lead to linear increases in K and corresponding inverse changes in λ. These measurements help to elucidate the intimate relationships between the degree of ordering of hydration water, hydration forces, and the mechanical stiffness of polysaccharides. For phytoglycogen, the addition of chemical groups, both cationic and anionic, produced significant increases in its water holding capacity and mechanical properties, suggesting that chemical modification can be used to tune the properties of phytoglycogen for different applications.
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