氨基葡萄糖分子上羧基含量对壳聚糖性能影响

发布时间：2018-02-28 02:41

本文关键词： 漆酶-TEMPO 壳聚糖羧基含量抗氧化性包装材料　出处：《包装工程》2017年13期 　论文类型：期刊论文

【摘要】：目的利用漆酶-TEMPO(TEMPO为2,2,6,6-四甲基哌啶-1-氧基的简称)体系氧化低聚壳聚糖,探究氨基葡萄糖分子上引入的羧基含量对壳聚糖性能的影响,以期壳聚糖在包装方面的应用能够更为广泛。方法通过高效离子色谱(HPIC)检测样品的钠离子含量表征样品的羧基含量,通过检测样品的吸湿保湿性、抗氧化性能表征壳聚糖物理化学性能的改善程度。结果壳聚糖分子上引入羧基有利于改善其吸湿、保湿性能,氧化产物在饱和碳酸钾与饱和硫酸铵溶液中60 h后吸湿率最高达63.0%,18.4%,保湿率为5.7%,而当氧化程度超过45.31%时,氧化产物的吸湿、保湿性能保持不变。结论 TEMPO添加量越多,氧化产物的羧基含量越高。引入的羧基基团能够改善壳聚糖氧化产物的吸湿、保湿性能,而增加氨基葡萄糖分子上的羧基含量,会提高壳聚糖的抗氧化性能。这些性能的提高对壳聚糖在包装材料的应用具有长远意义。
[Abstract]:Objective to study the effect of carboxyl content introduced on glucosamine on the properties of chitosan by oxidizing oligosaccharides by using laccase -TEMPOOTEMPO system. Methods High performance Ion Chromatography (HPLC) was used to detect the sodium ion content of the sample, and the carboxyl group content of the sample was characterized, and the moisture and moisture retention of the sample was determined by measuring the moisture and moisture retention of the sample. Results the introduction of carboxyl group into chitosan molecule can improve its moisture absorption and moisture retention. After 60 hours of saturated potassium carbonate and saturated ammonium sulfate solution, the highest hygroscopic rate of oxidation product was 63.0 and 18.4, and the moisture retention rate was 5.7. When the oxidation degree was more than 45.31, the moisture absorption and moisture retention of the oxidation product remained unchanged. Conclusion the more TEMPO is added, the higher the moisture retention rate is. The higher the carboxyl content of oxidation products is, the more carboxyl groups introduced can improve the moisture absorption and moisture retention of chitosan oxidation products, while increase the carboxyl content in glucosamine. These properties are of great significance for the application of chitosan in packaging materials.
【作者单位】：华南理工大学;
【基金】：国家自然科学基金(201404042) 广州市科技计划(201607020045)
【分类号】：TB484

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