Immobilization of Penicillin G Acylase in Epoxy-Activated Magnetic Cellulose Microspheres for Improvement of Biocatalytic Stability and Activities
- 4 October 2010
- journal article
- Published by American Chemical Society (ACS) in Biomacromolecules
- Vol. 11 (11), 2896-2903
- https://doi.org/10.1021/bm100642y
Abstract
We prepared magnetic cellulose porous microspheres (MCM) with mean diameter of ∼200 μm by employing the sol−gel transition (SGT) method from a mixture of magnemite ferrofluid and cellulose dissolved in 7 wt % NaOH/12% urea aqueous solvent precooled to −12 °C. Subsequently, the cellulose microspheres were activated with epoxy chloropropane to enhance loading efficiency of biomacromolecules. Their morphology, structure, and properties were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, and vibrating-sample magnetometer. The results indicated that the spherical magnetic γ-Fe2O3 nanoparticles with mean size of 10 nm were uniformly dispersed and embedded in the cellulose substrate of MCM, and the structure and nature of γ-Fe2O3 were conserved perfectly. Penicillin G acylase (PGA) as a biocatalyst was immobilized successfully in the porous microspheres, as a result of the existence of the cavity and affinity forces in the activated cellulose matrix. The immobilized PGA exhibited highly effective catalytic activity, thermal stability, and enhanced tolerance to pH variations. Furthermore, the cellulose microspheres loaded with the enzymes could be removed and recovered easily by introducing a magnetic field, leading to an acceptable reusability. Therefore, we have provided a simple and biocompatible support for the enzyme immobilization, which will be promising for the applications in the biomaterial fields.Keywords
This publication has 41 references indexed in Scilit:
- Dynamic Self-Assembly Induced Rapid Dissolution of Cellulose at Low TemperaturesMacromolecules, 2008
- Enzyme Immobilization: The Quest for Optimum PerformanceAdvanced Synthesis & Catalysis, 2007
- Improvement of enzyme activity, stability and selectivity via immobilization techniquesEnzyme and Microbial Technology, 2007
- Dilute solution properties of cellulose in LiOH/urea aqueous systemJournal of Polymer Science Part B: Polymer Physics, 2006
- Cellulose: Fascinating Biopolymer and Sustainable Raw MaterialAngewandte Chemie, 2005
- Ab Initio Study of Mutagen X: Importance of Ionization and SolvationBulletin of the Korean Chemical Society, 2002
- Epoxy Sepabeads: A Novel Epoxy Support for Stabilization of Industrial Enzymes via Very Intense Multipoint Covalent AttachmentBiotechnology Progress, 2002
- Electrostatic and covalent immobilisation of enzymes on ITQ-6 delaminated zeolitic materialsChemical Communications, 2001
- Preparation of aqueous magnetic liquids in alkaline and acidic mediaIEEE Transactions on Magnetics, 1981
- A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye bindingAnalytical Biochemistry, 1976