低温等离子体制备天然功能性多糖

天然多糖由于具有天然可再生、价格低廉、生物相容好等优点，受到广泛关注。该文选择具 有代表性的羧甲基纤维素钠和海藻酸钠作为研究对象，探讨了低温等离子体技术应用于多糖改性的可 行性。通过系统地研究等离子体处理对这两种多糖溶液黏度、pH 值、菌落总数及 1,1-二苯基-2-三硝 基苯肼清除率等性能的影响，并在此基础上，分析等离子体处理对两种多糖结构和性质的影响差异及 相关机制。实验结果表明，处理后的多糖具备了一定的抗菌及抗氧化性能。主要机制为：等离子体处 理过程中产生的能量，使多糖内部的分子键断裂；这个过程中，也引入了含氧、含氮等活性官能团， 与断键之后的多糖稳定结合，从而赋予其相应的功能。相较于传统的酸、碱和酶提取法制备功能性多 糖，低温等离子体更为稳定、高效且没有任何化学试剂污染。因此，低温等离子体处理为功能性多糖 的制备提供了新的方法。

The Effect of Cold Plasma Treatment on the Properties of Polysaccharides

Polysaccharides have attracted wide attention due to their renewable, biocompatibility and low cost. The objective of this research was to study the effect of cold plasma treatment on the properties of sodium carboxymethyl cellulose and sodium alginate. The viscosity, pH, total viable colonies and 1,1-diphenyl-2- picrylhydrazyl values were determined. Besides, the structures and mechanisms of sodium carboxymethyl cellulose and sodium alginate were also discussed. Results indicate that sodium carboxymethyl cellulose and sodium alginate modified with cold plasma treatment obtained antimicrobial and antioxidant ability. This is mainly attributes to the energy produced during plasma treatment breaks the molecular bonds within polysaccharides, meanwhile some active groups containing oxygen and nitrogen are introduced. Then the active groups could combine with the broken molecular band, lead to some functional properties. Compared with some traditional methods such as acid and alkali exaction, cold plasma treatment possesses stability and high efficiency, without any chemical pollution. Thus, cold plasma treatment provides a new method for the preparation of functional polysaccharides.