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首页> 外文期刊>Carbohydrate research >Isolation and Structural Analyses of Positional Isomers of 6~1, 6~n-di-O-(N-acetyl-#beta#-D-glucosaminyl)cyclomaltoheptaose (n = 2, 3, and 4) and 6-O-[6-O-(N-acetyl-#beta#-D-glucosaminyl)-N-acetyl-#beta#-D-glucosaminyl]cyclomaltoheptaose
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Isolation and Structural Analyses of Positional Isomers of 6~1, 6~n-di-O-(N-acetyl-#beta#-D-glucosaminyl)cyclomaltoheptaose (n = 2, 3, and 4) and 6-O-[6-O-(N-acetyl-#beta#-D-glucosaminyl)-N-acetyl-#beta#-D-glucosaminyl]cyclomaltoheptaose

机译：6〜1，6〜n-二-O-（N-乙酰基-＃beta＃-D-氨基葡萄糖基）环麦芽庚糖（n = 2、3和4）和6-O- [的位置异构体的分离和结构分析6-O-（N-乙酰基-＃beta＃-D-氨基葡萄糖基）-N-乙酰基-＃β＃-D-氨基葡萄糖基]环麦芽七糖

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摘要

6-O-[6-O-(N-acetyl-#beta#-D-glucosaminyl)-N-acetyl-#beta#-D-glucosaminyl]cyclomaltoheptaose (#beta#CD) and three positional isomers of 6~1, 6~n-di-O-(N-acetyl-#beta#-D-glucosaminyl)cyclomaltoheptaose (n = 2, 3 and 4) in a mixture of products from #beta#CD and N-acetylglucosamine by the reversed reaction of #beta#-N-acetylhexosaminidase from jack bean were isolated and purified by HPLC. The structures of four isomers of di-N-acetylglucosaminyl-#beta#CDs were determined by FABMS and NMR spectroscopy. The degree of polymerization of the branched oligosaccharides produced by enzymatic degradation with bacterial saccharifying #alpha#-amylase (BSA) was established by LC-MS methods.
机译：6-O- [6-O-（N-乙酰基-＃beta＃-D-氨基葡萄糖基）-N-乙酰基-βbeta--D-氨基葡萄糖基]环麦芽七糖（＃beta＃CD）和6〜1的三个位置异构体通过反向反应从＃beta＃CD和N-乙酰氨基葡萄糖的产物混合物中合成6〜n-二-O-（N-乙酰基-β-β-D-氨基葡萄糖氨基）环麦芽庚糖（n = 2、3和4）分离并纯化了来自波豆的＃β＃-N-乙酰己糖胺酶。通过FABMS和NMR光谱确定了二-N-乙酰氨基葡萄糖基-＃β＃CD的四个异构体的结构。通过LC-MS方法确定通过用细菌糖化＃α＃-淀粉酶（BSA）进行酶促降解产生的支链寡糖的聚合度。

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