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首页> 外文期刊>Carbohydrate research >Branching of hemicelluloses through an azetidinium salt ring-opening reaction
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Branching of hemicelluloses through an azetidinium salt ring-opening reaction

机译：通过氮杂环丁烷鎓盐开环反应支化半纤维素

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During the last century there has been a steady increase in the number of publications on practical applications of hemicellulose. Due to the water and moisture sensitivity, poor film-forming ability and lack of thermal processability most of the hemicelluloses need to be chemically modified prior to processing into materials. Within this study we present the results of azetidinium salts as a new functional group for conjugation to polysaccharides. The reactivity of three azetidinium salts on xylan, arabinoxylan and galactoglucomannan was investigated. Carbonyl groups were found to be favorable for the reaction with azetidinium salts and thus the glucuronic acid content in the hemicellulose determines the degree of substitution. TEMPO-oxidation of the hemicelluloses was done which successfully increased the degree of substitution. The highly reactive azetidinium salts are easily synthesized from secondary amines and epichlorohydrin and can be used as a new tool toward functionalization of hemicelluloses into the after sought properties. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在上个世纪，关于半纤维素的实际应用的出版物数量一直在稳定增长。由于对水和湿气的敏感性，差的成膜能力和缺乏热加工性，因此大多数半纤维素在加工成材料之前需要进行化学修饰。在这项研究中，我们介绍了氮杂环丁鎓盐作为与多糖结合的新功能基团的结果。研究了三种氮杂环丁烷鎓盐对木聚糖，阿拉伯木聚糖和半乳葡甘露聚糖的反应性。发现羰基对于与氮杂环丁鎓盐的反应是有利的，因此半纤维素中的葡糖醛酸含量决定了取代度。进行半纤维素的TEMPO-氧化，其成功地增加了取代度。高反应性的氮杂环丁鎓盐很容易由仲胺和表氯醇合成，可以用作将半纤维素官能化成所需性能的新工具。 （C）2016 Elsevier Ltd.保留所有权利。

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