低分子量南瓜多糖LWPP-Ia的结构研究  

Structure Elucidation of Low Molecular Weight Pumpkin Polysaccharide LWPP-Ia

作　　者：张凡华[1] 严浪[1] 张树明[1] 石宝霞[1] 李淑燕[1] 李全宏[1] 

机构地区：[1]中国农业大学食品科学与营养工程学院,北京100083

出　　处：《食品科学》2009年第1期25-27,共3页Food Science

基　　金：国家自然科学基金项目(30671469)

摘　　要：对从南瓜中提取出来的低分子量纯多糖LWPP-Ia,根据高碘酸氧化、Smith降解、甲基化反应及GC、GC-MS等方法,确证了其结构特征:由葡萄糖、果糖、半乳糖组成,摩尔比为3.6:1:1.2,为少分支结构,1,4-键型为主要键型,主链上的分支点为-~1Glu^2-,侧链末端主要由1位连接Glu和2位连接Fru,-~1Glu^2-构成侧链。By means ofperiodate oxidation,Smith degradation,methylation,GC,GC-MS,the structure of low molecular weight polysaccharide,LWPP-Ia isolated from pumpkin was analyzed.Monosaccharide composition analysis of LWPP-Ia indicated that it is a low branched molecule composed of glucose,fructose and galactose in the molar ratio of 3.6:1:1.2.The main chain is made up of(1→4)-linked-Glu and (1→4)-linked-Gall Some of(1→4)-linked-Glus were substituted at 2-O.The (1→2)- linked Glu is on the position 1 of side chain and th...

关 键 词：南瓜 多糖 结构 

分 类 号：TS255.1[轻工技术与工程—农产品加工及贮藏工程]