【摘要】 人参果胶是一酸性杂多糖混合物,经分离纯化获均一的S_A-1,它含半乳糖、半乳糖醛酸、阿拉伯糖、鼠李糖基摩尔比为3.7:1.7:1.8:1。S_A-1的结构分析用高碘酸氧化、Smith降解、甲基化等方法,在S_A-1中的羧基用Taylor与Conrad方法较原·来自S_A-1甲基化与乙酰化水解物的乙酰化衍生物用G.C.与G.C.—MS联用鉴定。结果表明S_A-1为多分支结构,分子主干由β（1-3）D-半乳糖基组成,部分半乳糖基C₆位有支链,尚有部分半乳糖基以（1-6）键连接。分子的支链由半乳糖醛酸基（1-4）,鼠李糖基（1-3或1-2,4）,阿拉伯糖基（1-5或1-3,5）组成。更多还原

【Abstract】 Ginseng pectin is a mixture of heteroglycans, By isolation ands purification the homogeneous S_A-1 was obtained which contains galactose, galacturonic acid, arabinose and rhamnose residues in the molar ratio of 3.7:1.7:1.8:1.Structural studies of S_A-1 were performed by periodate oxidation, Smith degradation and methylation etc. The carboxyl groups in the S_A-1 were reduced by Taylor. and Conrad methods: The alditol acetates obtained from methylatioh of S_A-1 and acetylation of its hydrolysate were identified by GC and GC-MS.The results of these studies indicate that S_A-1 is a highly branched molecule with β （1-3）D-galactan as its backbone. There are side chains on some of the galactose residues at C₆^′ position. The galacturonic acid residues （1-4）, Rhamnose residues （1-3 or 1-2,4）, arabinose （1-5 or 1-3,5） are found in the side chains. Besides, the （1-6） linkage of galactose residues is also present.更多还原