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首页> 外文期刊>Journal of the Science of Food and Agriculture >Structural studies of an acidic polysaccharide of Mesona blumes gum.
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Structural studies of an acidic polysaccharide of Mesona blumes gum.

机译：Mesona blumes胶的酸性多糖的结构研究。

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摘要

Mesona blumes gum can be isolated into a neutral polysaccharide (NMBG) and an acidic polysaccharide (AMBG). The yield of AMBG can be up to 90% (w/w). AMBG with a molecular weight of 6566 Da is composed of galactose, glucose, mannose, xylose, arabinose, rhamnose and galacturonic acid in the molar ratio 2.66:1:0.37:2.29:12.5:5.99:23.5. Structural features of the purified AMBG were investigated by a combination of chemical and instrumental analysis, such as periodate oxidation, Smith degradation, methylation, and 13C and 1H NMR. It was found that AMBG possessed a (1 -> 4)- alpha -galacturonan backbone with some insertions of (1 -> 2)- alpha -L-Rhap residues. The branches of arabinogalactan, arabinan, galactan and xylan were all attached to the backbone via O-4 of alpha -L-Rhap residues. In addition, some alpha -L-Rhap residues on the backbone terminated with alpha -L-Araf and some O-6 in galacturonic acid residues were acetylated or methyl esterified. The molecular structure of AMBG at different concentrations was observed by atomic force microscopy (AFM). It was found that AMBG showed spherical lumps at 1 micro g mL-1 but an irregular worm-like shape at 10 micro g mL-1, which indicated that the viscosity of AMBG might be caused by its notable molecular aggregation.
机译：Mesona羽胶可以分离成中性多糖（NMBG）和酸性多糖（AMBG）。 AMBG的产率可高达90％（w / w）。分子量为6566 Da的AMBG由半乳糖，葡萄糖，甘露糖，木糖，阿拉伯糖，鼠李糖和半乳糖醛酸组成，摩尔比为2.66：1：0.37：2.29：12.5：5.99：23.5。纯化的AMBG的结构特征是通过化学和仪器分析相结合进行研究的，例如高碘酸盐氧化，史密斯降解，甲基化以及13C和1H NMR。已发现AMBG具有（1→4）-α-半乳糖醛酸聚糖主链，并带有一些（1→2）-α-L-Rhap残基的插入。阿拉伯半乳聚糖，阿拉伯聚糖，半乳聚糖和木聚糖的分支都通过α-L-Rhap残基的O-4连接到骨架上。另外，主链上的一些α-L-Rhap残基被α-L-Araf终止，半乳糖醛酸残基中的一些O-6被乙酰化或甲基酯化。通过原子力显微镜（AFM）观察到了不同浓度的AMBG的分子结构。结果表明，AMBG在1 micro g mL-1处呈球形团块，而在10 micro g mL-1处呈不规则的蠕虫状，这表明AMBG的粘度可能是由其明显的分子聚集引起的。

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