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NMR法研究我国主要植物胶资源的多糖化学结构
NMR Studies on Chemical Structures of Polysaccharides of the Main Plant-gum Resources in China
【摘要】 植物种子多糖1H NMR和13C NMR分析表明,胡芦巴、皂荚、野皂荚和塔拉多糖与瓜尔多糖化学结构基本相同,同属半乳甘露聚糖,即主链由-β(1→4)-苷键连接的D-吡喃甘露糖组成,D-半乳糖以侧链形式通过α-(1→6)-苷键连接到主链甘露糖分子上;不同植物种子多糖,其半乳糖与甘露糖比值不同,其中胡芦巴1∶1.2、皂荚1∶2.5、野皂荚1∶3.2、塔拉1∶2.4(瓜尔1∶1.6);种子多糖均为中性粘多糖,熔点在263~272℃之间,粘均相对分子质量(MV)为206 000~343 900(瓜尔胶MV为430 600)。
【Abstract】 Polysaccharides isolated from seeds of fenugreek(Trigonella foenum-graecum),China honeylocust(Gleditsia sinensis),smalleaf honeylocust(G.microphyllfa) and tara(Caesalpinia spinosa) are composed of D-galactose and D-mannose,which are similar to galactomannan from guar gum.Structural studies are performed by GC,1H NMR and 13C NMR.All galactomannans possess molecules having main chains consisted of(1→4)-linked β-D-mannose residues,with different proportions of side chains consisted of single α-D-galactose residue linked to the main chain by(1→6)-bond.Ratios of galactose to mannose of the above polysaccharides are 1 ∶1.2,1 ∶2.5,1 ∶3.2 and 1 ∶2.4,respectively(guar gum 1 ∶1.6).Molecular weights(MV) are found to vary from 206 000(smalleaf honeylocust) to 343 900(tara).Melting points are situated between 263-(272℃)(Mv of guar gum is 430 600).
【Key words】 fenugreek; China honeylocust; smalleaf honeylocust; tara; seed polysaccharide;
- 【文献出处】 林产化学与工业 ,Chemistry and Industry of Forest Products , 编辑部邮箱 ,2006年01期
- 【分类号】Q946
- 【被引频次】49
- 【下载频次】568