Lipase Immobilization onto the Surface of PGMA-b-PDMAEMA-grafted Magnetic Nanoparticles Prepared via Atom Transfer Radical Polymerization

doi:10.1016/j.cjche.2014.09.029

Abstract

Abstract: A block copolymer of 2-dimethylaminoethyl methacrylate (DMAEMA) and glycidyl methacrylate (GMA) was grafted onto the surface of magnetic nanoparticles (Fe₃O₄) via atom transfer radical polymerization. The resultant PGMA-b-PDMAEMA-grafted-Fe₃O₄ magnetic nanoparticles with amino and epoxy groups were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction, thermo-gravimetric analysis, and scanning electron microscopy. Lipase from Burkholderia cepacia was successfully immobilized onto the magnetic nanoparticles by physical adsorption and covalent bonding. The immobilization capacity of the magnetic particles is 0.5 mg lipase per mg support, with an activity recovery of up to 43.1% under the optimum immobilization condition. Biochemical characterization shows that the immobilized lipase exhibits improved thermal stability, good tolerance to organic solvents with high lg P, and higher pH stability than the free lipase at pH 9.0. After six consecutive cycles, the residual activity of the immobilized lipase is still over 55% of its initial activity.

Key words: Enzyme, Atom transfer radical polymerization, Immobilized lipase, Fe₃O₄ nanoparticles

摘要： A block copolymer of 2-dimethylaminoethyl methacrylate (DMAEMA) and glycidyl methacrylate (GMA) was grafted onto the surface of magnetic nanoparticles (Fe₃O₄) via atom transfer radical polymerization. The resultant PGMA-b-PDMAEMA-grafted-Fe₃O₄ magnetic nanoparticles with amino and epoxy groups were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction, thermo-gravimetric analysis, and scanning electron microscopy. Lipase from Burkholderia cepacia was successfully immobilized onto the magnetic nanoparticles by physical adsorption and covalent bonding. The immobilization capacity of the magnetic particles is 0.5 mg lipase per mg support, with an activity recovery of up to 43.1% under the optimum immobilization condition. Biochemical characterization shows that the immobilized lipase exhibits improved thermal stability, good tolerance to organic solvents with high lg P, and higher pH stability than the free lipase at pH 9.0. After six consecutive cycles, the residual activity of the immobilized lipase is still over 55% of its initial activity.

关键词: Enzyme, Atom transfer radical polymerization, Immobilized lipase, Fe₃O₄ nanoparticles

Jingyun Wang, Fangling Ji, Jishuang Xing, Shuang Cui, Yongming Bao, Wenbo Hao . Lipase Immobilization onto the Surface of PGMA-b-PDMAEMA-grafted Magnetic Nanoparticles Prepared via Atom Transfer Radical Polymerization[J]. , 2014, 22(11/12): 1333-1339.

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