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首页> 外文期刊>Carbohydrate Polymers: Scientific and Technological Aspects of Industrially Important Polysaccharides >Chemical structure and rheological studies of arabinoglucuronoxylans from the Cercidium praecox exudate brea gum
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Chemical structure and rheological studies of arabinoglucuronoxylans from the Cercidium praecox exudate brea gum

机译：辛酸PRAECOX渗出物BREA GUM的Arabinoglucuronoxylans的化学结构和流变研究

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摘要

The structure of the arabinoglucuronoxylans from brea gum was elucidated through an chemical and NMR spectroscopical analysis. They are composed of xylose, arabinose, glucuronic acid and 4-O-methylglucuronic acid in a molar ratio 1:0.44:0.16:0.22. The structure consists of a central chain of (1 -> 4)-beta-D-xylopyranose of which ca.70% are susbstituted in C2 with single stubs of others sugars (beta-D-Xylp, alpha-D-GlcpA and 4-O-Me-alpha-D-GlcpA), with disaccharides (alpha-L-Arap-(1 -> 2)-4-O-Me-alpha-D-GlcpA-(1 ->, alpha-L-Arap-(1 -> 2)-alpha-D-GlcpA-(1 ->, beta-L-Araf-(1 -> 3)-alpha-L-Araf-(1 -> and alpha-L-Araf-(1 -> 3)-alpha-L-Araf-(1 -> 5), and possibly with trisaccharides of xylose. The determination of the location of the acetyl groups and their quantification in these arabinoglucuronoxylans has been achieved for the first time. Brea gum presents a higher thickening effect than gum arabic in 5% aqueous solution, demonstrating its potential usefulness for food and pharmaceutical applications.
机译：通过化学和NMR光谱分析阐明了来自BREA GUM的阿拉伯葡聚糖氧基羰基的结构。它们由木糖，阿拉伯糖，葡糖醛酸和4-甲基戊糖醛酸的摩尔比1：0.44：0.16：0.22组成。该结构由其中（1 - > 4）-β-D-木嘧啶的中央链组成，其中Ca.70％在C2中被含有单个残留的糖（Beta-D-Xylp，Alpha-D-Glcpa和4 -O-Me-alpha-d-glcpa），具有二糖（α-l- arap-（1 - > 2）-4-O-me-alpha-d-glcpa-（1 - >，alpha-l-arap - （1 - > 2） - alpha-d-glcpa-（1 - >，β-l- araf-（1 - > 3）-alpha-l-araf-（1 - >和alpha-l-Araf-（ 1 - > 3） - alpha-l- araf-（1 - > 5），并且可能是木糖的三糖。第一次已经实现了这些阿拉伯葡聚糖氧基毒物中的乙酰基的位置及其定量。Brea口香糖在5％水溶液中提出比阿拉伯语的更高的增稠效果，证明了其潜在的食品和药物应用的用途。

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