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

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Abstract

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.

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Acknowledgments

The authors thank the financial supports from the National Natural Science Foundation of China (Nos. 21374045, 21074049) and the Fundamental Research Funds for the Central Universities (No. lzujbky-2014-186).

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Authors and Affiliations

  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

    Weiwei Zhu, Chen Hou, Duo Pan, Jianjun He & Hao Zhu

  2. Suzhou Research Academy of North China Electric Power University, Suzhou, 215000, China

    Yimei Zhang & Hao Zhu

  3. Environmental Research Academy of North China Electric Power University, Beijing, 100000, China

    Yimei Zhang & Hao Zhu

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  1. Weiwei Zhu
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  2. Yimei Zhang
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  3. Chen Hou
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  4. Duo Pan
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  5. Jianjun He
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  6. Hao Zhu
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Correspondence to Hao Zhu.

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Zhu, W., Zhang, Y., Hou, C. et al. Covalent immobilization of lipases on monodisperse magnetic microspheres modified with PAMAM-dendrimer. J Nanopart Res 18, 32 (2016). https://doi.org/10.1007/s11051-016-3337-x

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