Molecular Diffusion in Polysaccharide Gel Systems as Observed by NMR
Molecular Diffusion in Polysaccharide Gel Systems as Observed by NMR
复制标题
NMR 观察到的多糖凝胶系统中的分子扩散
DOI：
10.1007/978-3-642-00865-8_24
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Akiko Mogi
中科院分区：
文献类型：
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作者：
S. Matsukawa;D. Sagae;Akiko Mogi
采用脉冲场梯度自旋回波（PFGSE）核磁共振法测定了树枝状大分子在琼脂凝胶中的扩散系数D和普鲁兰多糖在结冷胶凝胶中的扩散系数D。使用D与D0（稀释溶液中的扩散系数）的比值来估计网格尺寸。当温度低于胶凝温度时，筛孔尺寸增加，表明溶质多糖参与聚集。网孔尺寸的变化解释了在二价阳离子存在下，在压缩和结冷胶凝胶的耐热性下从储存的琼脂凝胶中渗出水的实验结果。
The diffusion coefficients D of dendrimers in agar gel and pullulan in gellan gel were determined by pulsed field gradient spin-echo (PFGSE) NMR measurements. The ratio of D to D 0 (diffusion coefficient in dilute solution) was used to estimate mesh size. The mesh size increased as the temperature fell below the gelling temperature, suggesting that the solute polysaccharides are involved in aggregation. Changes in mesh size explain the experimental results of water exudation from a stored agar gel under compression and the heat resistance of gellan gel in the presence of divalent cations.