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A Two-Enzyme Immobilization Approach Using Carbon Nanotubes/Silica as Support

机译:碳纳米管/二氧化硅为载体的两种酶固定化方法

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Multiple enzyme mixtures are attractive for the production of many compounds at an industrial level. We report a practical and novel approach for coimmobilization of two enzymes. The system consists of a silica microsphere core coated with two layers of individually immobilized enzymes. The model enzymes -amylase (AA) and glucoamylase (GluA) were individually immobilized on carbon nanotubes (CNTs). A CNT-GluA layer was formed by adsorbing CNT-GluA onto silica microsphere. A sol-gel layer with entrapped CNT-AA was then formed outside the CNT-GluA/silica microsphere conjugate. The coimmobilized -amylase and glucoamylase exhibited 95.1% of the activity of the mixture of free -amylase and glucoamylase. The consecutive use exhibited a good stability of the coimmobilized enzymes. The developed approach demonstrates advantages, including controlling the ratio of coimmobilized enzymes in an easy way, facilitating diffusion of small molecules in and out of the matrix, and preventing the leaching of enzymes. (c) 2014 American Institute of Chemical Engineers Biotechnol. Prog., 31:42-47, 2015
机译:多种酶混合物对于在工业水平上生产许多化合物具有吸引力。我们报告了两种酶共同固定化的一种实用新颖的方法。该系统由涂有两层分别固定的酶的二氧化硅微球核心组成。模型酶-淀粉酶(AA)和葡糖淀粉酶(GluA)分别固定在碳纳米管(CNT)上。通过将CNT-GluA吸附到二氧化硅微球上来形成CNT-GluA层。然后,在CNT-GluA /二氧化硅微球共轭物的外部形成了带有被包裹的CNT-AA的溶胶-凝胶层。共固定化淀粉酶和葡糖淀粉酶表现出游离淀粉酶和葡糖淀粉酶混合物的活性的95.1%。连续使用显示出共固定化酶的良好稳定性。所开发的方法显示出优点,包括以简单的方式控制共固定酶的比例,促进小分子向内和向外扩散以及防止酶的浸出。 (c)2014美国化学工程师学会生物技术学会。 Prog。,31:42-47,2015

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