School of Chemical Engineering, The University of Queensland, Brisbane, QLD, Australia; Australian Research Council Centre of Excellence in Plant Cell Walls, The University of Queensland, Brisbane, QLD, Australia.
School of Chemical Engineering, The University of Queensland, Brisbane, QLD, Australia; Australian Research Council Centre of Excellence in Plant Cell Walls, The University of Queensland, Brisbane, QLD, Australia.
Carbohydr Polym. 2018 Aug 1;193:179-188. doi: 10.1016/j.carbpol.2018.03.096. Epub 2018 Mar 30.
Two gel-forming arabinoxylan (AX) fractions with very similar linkage composition and molecular weight distributions have been isolated from Plantago ovata seed mucilage. Both isolated fractions have distinct gel properties attributed to differences in intermolecular hydrogen bonding. This study probes the effect of hydrogen bonding on molecular interactions of P. ovata AX fractions under non-gelled conditions achieved using a mild hydrogen bonding inhibitor, 0.2 M KOH. Chain conformation, relaxation dynamics and interactions between AX molecules are investigated using a combination of rheological techniques and small angle X-ray and neutron scattering. The scattering data confirm similar molecular dimensions and chain rigidity for both fractions, while showing distinct patterns of molecular interactions which result in the formation of a self-associated polymer network. The relationship between molecular associations, chain relaxation time and entanglement behaviour of P. ovata AX solutions are corroborated though the analysis of flow profiles and small amplitude oscillatory shear rheology.
从车前子种子黏液中分离得到两种凝胶形成阿拉伯木聚糖 (AX) 级分，它们具有非常相似的键合组成和分子量分布。两种分离的级分都具有独特的凝胶性质，这归因于分子间氢键的差异。本研究使用温和的氢键抑制剂 0.2 M KOH 来探究氢键对车前子 AX 级分在非凝胶条件下的分子相互作用的影响。使用流变技术和小角 X 射线和中子散射的组合来研究链构象、松弛动力学以及 AX 分子之间的相互作用。散射数据证实了两种级分具有相似的分子尺寸和链刚性，同时显示出不同的分子相互作用模式，导致自缔合聚合物网络的形成。通过对流动曲线和小振幅振荡剪切流变学的分析，证实了车前子 AX 溶液的分子缔合、链松弛时间和缠结行为之间的关系。
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