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Navicula sp. Sulfated Polysaccharide Gels Induced by Fe(III): Rheology and Microstructure

机译:Navicula sp。 Fe(III)诱导的硫酸化多糖凝胶的流变学和微观结构

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摘要

A sulfated polysaccharide extracted from Navicula sp. presented a yield of 4.4 (% w/w dry biomass basis). Analysis of the polysaccharide using gas chromatography showed that this polysaccharide contained glucose (29%), galactose (21%), rhamnose (10%), xylose (5%) and mannose (4%). This polysaccharide presented an average molecular weight of 107 kDa. Scanning electron microscopy (SEM) micrographs showed that the lyophilized Navicula sp. polysaccharide is an amorphous solid with particles of irregular shapes and sharp angles. The polysaccharide at 1% (w/v) solution in water formed gels in the presence of 0.4% (w/v) FeCl3, showing elastic and viscous moduli of 1 and 0.7 Pa, respectively. SEM analysis performed on the lyophilized gel showed a compact pore structure, with a pore size of approximately 150 nm. Very few studies on the gelation of sulfated polysaccharides using trivalent ions exist in the literature, and, to the best of our knowledge, this study is the first to describe the gelation of sulfated polysaccharides extracted from Navicula sp.
机译:从Navicula sp。提取的硫酸化多糖。产量为4.4(以干生物质%w / w为基准)。使用气相色谱法分析多糖表明该多糖含有葡萄糖(29%),半乳糖(21%),鼠李糖(10%),木糖(5%)和甘露糖(4%)。该多糖的平均分子量为107 kDa。扫描电子显微镜(SEM)的显微照片显示,冻干的Navicula sp。多糖是一种无定形固体,具有不规则形状和锐角的颗粒。 1%(w / v)的水溶液中的多糖在0.4%(w / v)FeCl3的存在下形成凝胶,弹性模量和粘弹性模量分别为1和0.7 Pa。在冻干的凝胶上进行的SEM分析显示出紧密的孔结构,其孔径为约150nm。在文献中很少有关于使用三价离子进行硫酸化多糖凝胶化的研究,据我们所知,这项研究是第一个描述从纳维库拉菌种中提取的硫酸化多糖凝胶化的研究。

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