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作 者:刘春兰[1] 邓义红[1] 王文蜀[1] 徐桂云[2] 杜宁[1]
机构地区:[1]中央民族大学生命与环境科学学院,北京100081 [2]中国科学院化学研究所,北京100080
出 处:《应用基础与工程科学学报》2009年第2期248-256,共9页Journal of Basic Science and Engineering
基 金:国家“985”工程--中央民族大学“985”工程重点科研项目(cun985-3-3);“111创新引智计划”工程项目(B08044)
摘 要:通过采用热水提取乙醇沉淀获得雪莲水溶性粗多糖,经酸性乙醇分级和DEAE-SephdexA-25纯化得多糖XL31.纸层析、醋酸纤维薄膜电泳和SepharoseCL-4B柱层析纯度鉴定表明XL31为均一多糖,分子量约为170kD.其单糖组成为阿拉伯糖(Ara)、鼠李糖(Rha)、木糖(Xyl)、半乳糖(Gal)、葡萄糖(Glc)、半乳糖醛酸(GalA),摩尔比为11∶4∶1∶18∶3∶9.XL31结构分析采用了高碘酸氧化、Smith降解、甲基化分析及IR、NMR、GC和GC-MS等方法.结果表明:多糖XL31主链由Ara、Gal、GalA构成,其中Ara主要以β-(1→4)或β-(1→5)糖苷键连接,在3-O处有分枝,Gal主要以β-(1→6)及β-(1→4)糖苷键连接,β-(1→6)糖苷键连接在3-O和4-O处有分枝,β-(1→4)糖苷键连接在2-O、3-O和6-O处有分枝;GalA以α-(1→4)糖苷键连接.支链由Xyl、Rha、Glc构成,其中Xyl以1→4或1→5糖苷键连接;Rha以1→2、4糖苷键连接;Glc以1→4糖苷键连接.末端残基为GalA、Gal、Ara、Xyl、Rha、Glc.雪莲多糖XL31是一新结构多糖,为首次从新疆雪莲中分离得到.The crude polysaccharide was extracted from Saussurea involucrate. After acidic ethanol fractionation and DEAE-SephadexA-25 gel filtration, XL31 was got. Its homogeneity was confirmed by paper chromatography, chromatography on Sepharose CL-4B and cellulous acetate electrophoresis. XL31 was composed of arabinose(Ara) ,rhamose (Rha), xylose ( Xyl), galactose ( Gal), glucose ( Glc ), galacturonic acid ( GalA ) and its molar ratio is 11: 4: 1: 18: 3: 9. Its average molecular weight is 170kD. By means of HIO4 oxidation, Smith degradation, methylation and IR, NMR, GC, GC-MS analysis, the structure of XL31 was identified. Its main chain is mainly made up of β - ( 1 →4 ) -linked or β - ( 1→5 ) -linked Ara, β- ( 1→6 ) -linked Gal, β- ( 1→4 ) -linked Gal and α-( 1 →4 ) -linked GalA residues. β-( 1→4 ) -linked or β-( 1→5 ) -linked Ara is substituted at 3-O; (1→6)-linked Gal is substituted at 3-O and 4-O; (1→4)-linked Gal is substituted at 2-O,3-O and 6-O; The side chain is composed of (1→4 )or (1→5 )- linked Xyl, ( 1 → 4 ) -linked Glc and ( 1 → 2, 4 ) -linked Rha. The nonreduced end is composed of GalA, Gal, Ara, Xyl, Rha, Glc.
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