微流变学
化学工程
化学
碱金属
氢键
分子间力
化学物理
光谱学
形态学(生物学)
葡甘露聚糖
结晶学
材料科学
流变学
分子
有机化学
复合材料
物理
工程类
生物
量子力学
生物化学
遗传学
作者
Yun Zhou,Runsheng Jiang,Wade S. Perkins,Yongqiang Cheng
标识
DOI:10.1016/j.foodchem.2018.05.116
摘要
A molecular-level mechanism of alkali induced konjac glucomannan (KGM) hydrogel gelation processing is considered with the application of nuclear magnetic resonance (NMR) spectroscopy and atomic force microscopy (AFM) as complementary methods to diffusive wave spectroscopy (DWS) microrheology and thermoanalysis. It is shown that deacetylation of KGM chains occurs immediately upon mixing with Na2CO3, inducing self-packaging. Partial unfolding of the packed loose structure of dehydrated KGM is observed upon heating. The configuration transition from random coils to self-assembling filament networks takes place before KGM aggregating to form large irreversible bundles with a lower degree of cross-linking. The gelation is not fulfilled until the temperature is increased to above 70 °C when the significant agglomeration is initiated among transitional fibrils to form junction zones essentially composed of acetyl-free portions. This suggests the intermolecular aggregation of KGM chains not simply regarding to hydrogen bonds, but essentially relating to hydrophobic interactions.
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