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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Guar Gum and Scleroglucan Interactions with Borax: Experimental and Theoretical Studies of an Unexpected Similarity
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Guar Gum and Scleroglucan Interactions with Borax: Experimental and Theoretical Studies of an Unexpected Similarity

机译：瓜耳胶和硬葡聚糖与硼砂的相互作用：意外相似性的实验和理论研究

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摘要

Guar gum is a galactomannan that assumes a very flexible conformation in solution, while Scleroglucan is a very rigid polysaccharide that dissolves in water as triple helices. Both polymers can form gels in the presence of borax. Despite their structural differences, the freeze-dried gel systems of both polymers, when compressed to form tablets, show a peculiar anisotropic swelling in water that reflects an amazing similarity in terms of their molecular properies. In this paper the behavior of the Guar/borax gel is compared with that of Scleroglucan/ borax. The macroscopic properties of the two systems were characterized in terms of Theological measurements. Atomic force microscopy images and molecular dynamics simulation allowed to evaluate, at molecular level, the effect of borax addition to the Guar polymer. Both experiments show that an increasing of the polymer rigidity is produced by borax. The role played by galactose in the side chain was also discussed.
机译：瓜尔豆胶是半乳甘露聚糖，在溶液中呈非常柔性的构象，而硬葡聚糖是非常坚硬的多糖，其以三重螺旋状溶于水。两种聚合物都可以在硼砂存在下形成凝胶。尽管它们的结构有所不同，但两种聚合物的冻干凝胶体系在压制成片后，在水中却表现出独特的各向异性溶胀，这反映了它们在分子特性方面的惊人相似性。本文将瓜尔胶/硼砂凝胶的行为与硬葡聚糖/硼砂的行为进行了比较。根据神学测量来表征两个系统的宏观特性。原子力显微镜图像和分子动力学模拟可以在分子水平上评估将硼砂添加到瓜尔胶中的作用。两项实验均表明，硼砂可提高聚合物的刚度。还讨论了半乳糖在侧链中的作用。

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