- P-ISSN 1225-0163
- E-ISSN 2288-8985
고정화 지지체로 사용된 실리카 나노입자와 실리카 코팅된 자성 나노입자에 작용기를 부착시켜기능성을 부가한 후 효소인 리파아제를 고정화하여 리파아제의 안정성을 향상시키고자 연구를 수행하였다. 지지체에 부착하는 작용기가 고정화된 효소의 활성과 안정성에 미치는 영향도 살펴보았다. 실리카 나노입자와 실리카 코팅된 자성 나노입자에 부착한 작용기인 epoxy group과 amine group은 glycidyl methacrylate과 aminopropyl triethoxysilane을 통해 실리카 나노입자와 실리카 코팅된 자성 나노입자 표면에 각각 부착하였다. 작용기가 부착된 실리카 나노입자와 실리카 코팅된 자성 나노입자에 고정화한Candida rugosa lipase는 자유효소에 비해 초기반응속도는 다소 낮았지만, 3회 재사용한 후 측정한 활성이 최초 활성 대비 92 % 이상의 활성을 유지하였다. 또한, 실리카 코팅된 자성 나노입자에 glutaraldehyde 를 이용한 cross-linked enzyme aggregate (CLEA) 방법과 공유결합법을 통해 라파아제를 각각 고정화한연구를 수행한 결과, 실리카 나노입자와 실리카 코팅된 자성 나노입자에 CLEA 방법과 공유결합법으로각각 고정화한 Candida rugosa lipase는 자유효소에 비해 초기반응속도 뿐만 아니라 최종 활성도 높았고, 5회 재사용한 후 측정한 활성이 최초 활성 대비 73 % 이상의 활성을 유지하였다.
The present study investigated the immobilization of lipases on silica nanoparticles and silica-coated magnetite nanoparticles as supports with a functional group to enhance the stability of lipase. The influence of functional groups, such as the epoxy group and the amine group, on the activity and stability of immobilized lipase was also studied. The epoxy group and the amino group were introduced onto the surface of nanoparticles by glycidyl methacrylate and aminopropyl triethoxysilane, respectively. Immobilized Candida rugosa lipase on silica nanoparticles and silica-coated magnetite nanoparticles with a functional group showed slightly lower initial enzyme activities than free enzyme; however, the immobilized Candida rugosa lipase retained over 92 % of the initial activity, even after 3 times reuse. Lipase was also immobilized on the silica-coated magnetite nanoparticles by cross-linked enzyme aggregate (CLEA) using glutaraldehyde and covalent binding, respectively, were also studied. Immobilized Candida rugosa lipase on silica nanoparticles and silica-coated magnetite nanoparticles by CLEA and covalent binding showed higher enzyme activities than free enzyme, while immobilized Candida rugosa lipase retained over 73 % of the initial activity after 5 times reuse.
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