高相对分子质量甲壳素、壳聚糖的制备

Preparation of High Relative Molecular Mass Chitin and Chitosan

采用红外光谱分析甲壳素、壳聚糖的主要性能指标 ,研究了EDTA和HCl用于制备甲壳素的脱钙工艺 ,其结果为 :EDTA可替代HCl用于制备甲壳素的脱钙工艺 ,特别是由于其所特有的脱钙机理 ,脱钙时对甲壳素碳骨架基本无损伤 ,因此其产品的分子质量较HCl法的大 ,在同等条件下 ,可制得高相对分子质量的甲壳素和壳聚糖。其它性能指标如产率 ,脱乙酰度 ,颜色等均优于采用HCl法制得的产品。此外 ,EDTA法还可减少环境污染 ,而不增加成本。

The methods using EDTA and HCl to remove CaCO 3 i n preparation of chitin were studied by IR spectrometer and analyzing the proper ties of chitin and chitosan. The results showed that EDTA could replace HCl in p roduction of chitin for removing CaCO 3. Especially owing to the mechanism of removing CaCO 3 that EDTA possessed, there was nearly no damage to the m olecular chains of chitin during the process of removing CaCO 3. The molecu le mass of its product was bigger than that product treated by HCl for removing CaCO 3. Therefore, The high relative molecular mass chitin and chitosan cou ld be prepared in the same condition, and all the other properties such as produ ctivity, degree of deacetylation and color etc. were better than that product tr eated by HCl. Furthermore this process could reduced the pollution in production of chitin, and the cost of it was not high than the process with HCl.