Correlation Between Chain Architecture and Hydration Water Structure in Polysaccharides
Correlation Between Chain Architecture and Hydration Water Structure in Polysaccharides
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DOI：
10.1021/acs.biomac.6b00026
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发表时间：
2016-03-01
影响因子：
6.2
通讯作者：
Dutcher, John R.
中科院分区：
文献类型：
--
作者：
Grossutti, Michael;Dutcher, John R.
承压水的物理性质与散装水的物理性质有很大的不同。与多糖相关的水合水提供了一个特别有趣的封闭水的例子，因为多糖结构的差异为水吸附提供了不同的空间封闭环境。我们已经使用衰减全反射红外（ATR-IR）光谱法研究在受控的相对湿度（RH）条件下，三种不同的多糖膜中的水合水的结构。我们比较了两个无分支的多糖，透明质酸（HA），和壳聚糖获得的高度分支，树枝状聚合物样的植物糖原纳米粒子的薄膜所获得的结果。我们发现在两个线性多糖和植物糖原的显着差异的水结构之间的相似性。特别是，结果表明，植物糖原的高度支化导致更有序的水结构（低密度，高连通性网络水），表明链结构对水结构的强烈影响。这些测量为多糖的结构和水合作用之间的关系提供了独特的见解，这对于在广泛的应用中理解和利用这些可持续的纳米材料非常重要。
The physical properties of confined water can differ dramatically from those of bulk water. Hydration water associated with polysaccharides provides a particularly interesting example of confined water, because differences in polysaccharide structure provide different spatially confined environments for water sorption. We have used attenuated total reflection infrared (ATR-IR) spectroscopy to investigate the structure of hydration water in films of three different polysaccharides under controlled relative humidity (RH) conditions. We compare the results obtained for films of highly branched, dendrimer-like phytoglycogen nanoparticles to those obtained for two unbranched polysaccharides, hyaluronic acid (HA), and chitosan. We find similarities between the water structuring in the two linear polysaccharides and significant differences for phytoglycogen. In particular, the results suggest that the high degree of branching in phytoglycogen leads to a much more well-ordered water structure (low density, high connectivity network water), indicating the strong influence of chain architecture on the structuring of water. These measurements provide unique insight into the relationship between the structure and hydration of polysaccharides, which is important for understanding and exploiting these sustainable nanomaterials in a wide range of applications.