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Optimized synthesis of specific sizes of maltodextrin glycosides by the coupling reactions of Bacillus macerans cyclomaltodextrin glucanyltransferase

机译:通过Macerans芽孢杆菌环麦芽糖糊精葡聚糖转移酶的偶联反应优化麦芽糖糊精糖苷特定大小的合成

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摘要

Bacillus macerans cyclomaltodextrin glucanyltransferase (CGTase,EC 2.4.1.19),in reaction with cyclomaltohexaose and methyl alpha-D-glucopyranoside,methyl beta-D-glucopyranoside,phenyl alpha-D-glucopyranoside,and phenyl beta-D-glucopyranoside gave four kinds of maltodextrin glycosides.The reactions were optimized by using different ratios of the individual D-glucopyranosides to cyclomaltohexaose,from 0.5 to 5.0,to obtain the maximum molar percent yields of products,which were from 68.3% to 78.6%,depending on the particular D-glucopyranoside,and also to obtain different maltodextrin chain lengths.The lower ratios of 0.5-1.0 gave a wide range of sizes from d.p.2-17 and higher.As the molar ratio was increased from 1.0 to 3.0,the larger sizes,d.p.9-17,decreased,and the small and intermediate sizes,d.p.2-8,increased;as the molar ratios were increased further from 3.0 to 5.0,the large sizes completely disappeared,the intermediate sizes,d.p.4-8,decreased,and the small sizes,d.p.2 and 3 became predominant.A comparison is made with the synthesis of maltodextrins by the reaction of CGTase with different molar ratios of D-glucose to cyclomaltohexaose.
机译:Macerans芽孢杆菌环麦芽糊精葡聚糖转移酶(CGTase,EC 2.4.1.19)与环麦芽糖和甲基α-D-吡喃葡萄糖苷,甲基β-D-吡喃葡萄糖苷,苯基α-D-吡喃葡萄糖苷和苯基β-D-吡喃葡萄糖苷反应生成四种通过使用不同比例的D-吡喃葡萄糖苷与环麦芽六糖比例从0.5到5.0来优化反应,以获得最大的摩尔百分产率,从68.3%到78.6%,这取决于特定的D-较低的比值0.5-1.0给出了dp2-17和更大的尺寸范围。当摩尔比从1.0增加到3.0时,dp9-具有更大的尺寸范围。 17减小,中小尺寸dp2-8增大;随着摩尔比从3.0进一步增加到5.0,大尺寸完全消失,中间尺寸dp4-8减小而小大小,dp2和3变为比较了通过具有不同摩尔比的D-葡萄糖与环麦芽六糖的CGTase的反应与麦芽糊精的合成。

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