Hierarchical Magnetic Core-Shell Gel Platform for Lipase Immobilization: Enhanced Catalytic Performance

Area of Science:

• Biocatalysis and Enzyme Engineering
• Materials Science for Biotechnology
• Green Chemistry and Sustainable Processes

Background:

• Lipase immobilization is crucial for enhancing enzyme stability and reusability in industrial applications.
• Existing immobilization methods often face challenges with enzyme leaching and reduced activity.
• Developing advanced support materials is essential for efficient and sustainable biocatalysis.

Purpose of the Study:

• To develop a hierarchical magnetic core-shell gel platform for enhanced lipase immobilization.
• To investigate the synergistic effects of covalent immobilization and gel encapsulation on enzyme performance.
• To evaluate the potential of the immobilized lipase for biodiesel production.

Main Methods:

• Fabrication of a magnetic Fe3O4 core with a multiamine-functionalized silica shell.
• Covalent attachment of lipase (L) to the silica shell using glutaraldehyde cross-linking.
• Encapsulation of the immobilized lipase within a hydrophilic calcium alginate (CaAlg) gel matrix, forming Fe3O4@SiO2L@CaAlg.

Main Results:

• Achieved a high immobilization efficiency of 83.5% under optimized conditions.
• Demonstrated significantly enhanced catalytic performance and reusability compared to unencapsulated lipase.
• Reduced apparent activation energy to 37.8 kJ/mol and retained 67.7% activity after five cycles.
• Attained a biodiesel yield of 75.79% using the Fe3O4@SiO2L@CaAlg platform.

Conclusions:

• The hierarchical magnetic core-shell gel platform effectively immobilizes lipase, enhancing its catalytic efficiency and stability.
• The combination of covalent attachment and CaAlg gel encapsulation preserves enzyme hydration and prevents leaching.
• This advanced biocatalyst shows significant promise for efficient and sustainable industrial biodiesel production.