摘要
玉米须经蒸馏水提取、离子交换、分子筛层析等手段得玉米须多糖(SMPS),结构分析研究表明SMPS的分子量约7 000 Da,其单糖组成和比例为鼠李糖∶阿拉伯糖∶木糖∶甘露糖∶半乳糖∶葡萄糖=0. 18∶0. 75∶0. 67∶1. 22∶1. 42∶6. 82; SMPS的重复单元可能是由甘露糖、半乳糖、葡萄糖构成,甘露糖主要以1→6连接存在于主链中,葡萄糖的主要的连接方式为1→3、1→4、1→6连接,木糖在主链及支链中均有存在,半乳糖主要存在于主链的末端.
One kind of stigma maydis polysaccharide( SMPS) was extracted from stigma maydis by distilled water,then purified by ion exchange chromatography and molecular sieve chromatography. The results of structural studies showed that SMPS was composed of rhamnose,arabinose,xylose,mannose,galactose and glucose( 0. 18 ∶0. 75 ∶0. 67 ∶1. 22 ∶1. 42 ∶6. 82) with apparent molecular weight of 7 × 10~3 Da. SMPS has a repeating unit composed of mannose,galactose and glucose. Mannose mainly exists as →6)-Man-( 1 → in the main chain. Glucose mainly exists as →3)-Glc-( 1 →,→ 4)-Glc-( 1 → and → 6)-Glc-( 1 → in the pdysaccharide. Xylose exists in both backbone and branch chain. Galactose mainly exists at the end of the main chain.
引文
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