Covalent immobilization of lipases on monodisperse magnetic microspheres modified with PAMAM-dendrimer

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• 作者：Weiwei Zhu ; Yimei Zhang ; Chen Hou ; Duo Pan ; Jianjun He…
• 关键词：Magnetic nanoparticles ; Lipase immobilization ; Dendritic modification
• 刊名：Journal of Nanoparticle Research
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：18
• 期：2
• 全文大小：2,021 KB
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• 作者单位：Weiwei Zhu (1)
  Yimei Zhang (2) (3)
  Chen Hou (1)
  Duo Pan (1)
  Jianjun He (1)
  Hao Zhu (1) (2) (3)
  
  1. State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Institute of Biochemical Engineering and Environmental Technology, Lanzhou University, Lanzhou, 730000, China
  2. Suzhou Research Academy of North China Electric Power University, Suzhou, 215000, China
  3. Environmental Research Academy of North China Electric Power University, Beijing, 100000, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Nanotechnology
  Inorganic Chemistry
  Characterization and Evaluation Materials
  Physical Chemistry
  Applied Optics, Optoelectronics and Optical Devices
  
• 出版者：Springer Netherlands
• ISSN：1572-896X

文摘

This paper reported an immobilization of Candida rugosa lipase (CRL) onto PAMAM-dendrimer-grafted magnetic nanoparticles synthesized by a modified solvothermal reduction method. The dendritic magnetic nanoparticles were amply characterized by several instrumental measurements, and the CRL was covalently anchored on the three generation supports with glutaraldehyde as coupling reagent. The amount of immobilized enzyme was up to 150 mg/g support and the factors related with the enzyme activity were investigated. The immobilization of lipase improved their performance in wider ranges of pH and temperature. The immobilized lipase exhibited excellent thermal stability and reusability in comparison with free enzyme and can be reused 10 cycles with the enzymatic activity remained above 90 %. The properties of lipase improved obviously after being immobilized on the dendritic supports. The inactive immobilized lipase could be regenerated with glutaraldehyde and Cu2+, respectively. This synthetic strategy was facile and eco-friendly for applications in lipase immobilization. Keywords Magnetic nanoparticles Lipase immobilization Dendritic modification