Quick separation and enzymatic performance improvement of lipase by ionic liquid-modified Fe3O4 carrier immobilization
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To promote the activity and stability of immobilized porcine pancreatic lipase (PPL), novel carrier was combined with special immobilization method. Enzymatic activity was enhanced after immobilized onto ionic liquid modified magnetic Fe3O4 by electrostatic adsorption. Activity of immobilized enzyme (PPL-IM/BF4-Fe3O4@CA) reached 596 U/g PPL. Through the combination of electrostatic adsorption and embedding immobilization methods, we improve binding force between the carrier and enzyme, and further enhance the efficiency and stability of immobilized enzyme. The activity of PPL-IM/BF4-Fe3O4@CA after repeated third use was 78%. After storage at room temperature for 5 days, the residual activity was 89%. Enzymatic properties and catalytic kinetics of immobilized enzymes were studied, and the effect mechanism of ionic liquid modified Fe3O4 on PPL was revealed. The effect of ionic liquid on the carrier structure was investigated by characterization of XRD, FT-IR, SEM and TG. The mechanism and enzymatic properties of immobilized PPL via electrostatic adsorption and embedding were analyzed. A novel and efficient immobilized PPL was developed.
KeywordsImmobilization Fe3O4 Ionic liquid Lipase Surface modification
The work was funded by the National Natural Science Foundation of China (no. 21406093), the Natural Science Foundation of Jiangsu province (BK20140529), Key University Science Research Project of Jiangsu Province (14KJB530001), China Postdoctoral Science Foundation (2014M550271), and the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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