SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 37 ›› Issue (9): 128-136.DOI: 10.1016/j.cjche.2020.11.003

• Biotechnology and Bioengineering • 上一篇    下一篇

Covalent immobilization and characterization of Rhizopus oryzae lipase on core-shell cobalt ferrite nanoparticles for biodiesel production

Saboura Ashkevarian1,2, Jalil Badraghi1, Fatemeh Mamashli2, Behdad Delavari2, Ali Akbar Saboury2,3   

  1. 1. Research Institute of Applied Sciences, ACECR, Shahid Beheshti University, Tehran, Iran;
    2. Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran;
    3. Center of Excellence in Biothermodynamics, University of Tehran, Tehran, Iran
  • 收稿日期:2020-03-26 修回日期:2020-11-03 出版日期:2021-09-28 发布日期:2021-11-02
  • 通讯作者: Jalil Badraghi, Ali Akbar Saboury
  • 基金资助:
    The work, originated from a Ph.D. thesis, was financially supported by Research Institute of Applied Science (RIAS) ACECR, Institute of Biochemistry and Biophysics (IBB) and Iran National Science Foundation (INSF).

Covalent immobilization and characterization of Rhizopus oryzae lipase on core-shell cobalt ferrite nanoparticles for biodiesel production

Saboura Ashkevarian1,2, Jalil Badraghi1, Fatemeh Mamashli2, Behdad Delavari2, Ali Akbar Saboury2,3   

  1. 1. Research Institute of Applied Sciences, ACECR, Shahid Beheshti University, Tehran, Iran;
    2. Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran;
    3. Center of Excellence in Biothermodynamics, University of Tehran, Tehran, Iran
  • Received:2020-03-26 Revised:2020-11-03 Online:2021-09-28 Published:2021-11-02
  • Contact: Jalil Badraghi, Ali Akbar Saboury
  • Supported by:
    The work, originated from a Ph.D. thesis, was financially supported by Research Institute of Applied Science (RIAS) ACECR, Institute of Biochemistry and Biophysics (IBB) and Iran National Science Foundation (INSF).

摘要: Rhizopus oryzae lipase (ROL) was immobilized on the surface of silica coated amino modified CoFe2O4 nanoparticles and applied for biodiesel production. The results indicated more affinity of the ROL toward its substrate upon immobilization, as revealed by a lower Km value for the immobilized ROL compared to its free counterpart. Intrinsic fluorescence spectroscopy indicated a lower intensity for ROL immobilized on CoFe2O4 nanoparticles. Besides, immobilized ROL steady state anisotropy measurements presented lower values, which implied assembly of ROL molecules on magnetic nanoparticles upon immobilization as well as their restricted rotation upon covalent attachment. Thermal stability analysis revealed improved activity at higher temperatures for the immobilized enzyme compared to its free counterpart. Accordingly, Pace analysis to determine protein thermal stability revealed preservation of the protein conformation in the presence of increasing temperatures upon immobilization on nanoparticles. Finally, ROL immobilized on CoFe2O4 nanoparticles exhibited improved efficiency of biodiesel production in agreement with thermal activity profile. Therefore, the authors suggest application of the lipase molecules immobilized on CoFe2O4 nanoparticles for more efficient biodiesel production.

关键词: Lipase immobilization, CoFe2O4 magnetic nanoparticles, Steady state anisotropy, Biodiesel, Biocatalysis, Protein stability

Abstract: Rhizopus oryzae lipase (ROL) was immobilized on the surface of silica coated amino modified CoFe2O4 nanoparticles and applied for biodiesel production. The results indicated more affinity of the ROL toward its substrate upon immobilization, as revealed by a lower Km value for the immobilized ROL compared to its free counterpart. Intrinsic fluorescence spectroscopy indicated a lower intensity for ROL immobilized on CoFe2O4 nanoparticles. Besides, immobilized ROL steady state anisotropy measurements presented lower values, which implied assembly of ROL molecules on magnetic nanoparticles upon immobilization as well as their restricted rotation upon covalent attachment. Thermal stability analysis revealed improved activity at higher temperatures for the immobilized enzyme compared to its free counterpart. Accordingly, Pace analysis to determine protein thermal stability revealed preservation of the protein conformation in the presence of increasing temperatures upon immobilization on nanoparticles. Finally, ROL immobilized on CoFe2O4 nanoparticles exhibited improved efficiency of biodiesel production in agreement with thermal activity profile. Therefore, the authors suggest application of the lipase molecules immobilized on CoFe2O4 nanoparticles for more efficient biodiesel production.

Key words: Lipase immobilization, CoFe2O4 magnetic nanoparticles, Steady state anisotropy, Biodiesel, Biocatalysis, Protein stability