摘要
采用热重、热重-红外联用及差示扫描量热法研究苦丁茶冬青叶多糖KPSⅢa的热稳定性。结果表明,苦丁茶冬青叶多糖在225℃以下只失去吸附水,在225~625℃间发生剧烈的裂解反应,产生水和二氧化碳;与肝素、淀粉、半乳糖及甲壳素的热分析比较,含有硫酸酯的苦丁茶冬青叶多糖和肝素的热稳定性较低,含氨基的甲壳素的热稳定性最好。说明苦丁茶冬青叶多糖在225℃以下相对稳定,不同的基团对多糖的热稳定性有很大影响。
The thermal decomposition of polysaccharide fraction KPS Ⅲa from leaves ofllex kudingcha C. J. Tseng was studied by using thermogravimetry (TG), thermogravimetry-infrared (TG-IR) and differential scanning calorimetry (DSC) in N2. The results showed that the KPS Ⅲ a is stable below 225 ℃ and only release a little of water. KPS Ⅲa is decomposed at 225 to 625 ℃ and release a great deal of water and carbon dioxide. Compared to galactose and starch, the thermal stability of the sulphated polysaccharide KPS Ⅲa and heparin are lower but the amino polysaccharide, chitin is higher. All these results demonstrated that the KPS Ⅲ a is stable below 225 ℃, and different groups have great effects on the thermal stability of the polysaccharide.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2009年第9期44-46,共3页
Food Science
基金
辽宁省教育厅科学研究计划项目(05L162)
作者简介
王新(1976-),男,讲师,硕士,主要从事天然产物活性成分研究。E-mail:wangxinlnu@yahoo.com.cn
通讯作者:刘彬(1970-),女,副教授,博士研究生,主要从事天然产物活性成分研究。E—mail:liubinzehao@163.com