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- W2092825009 abstract "A novel and efficient immobilization of β-d-galactosidase from Aspergillus oryzae has been developed by using magnetic Fe3O4–chitosan (Fe3O4–CS) nanoparticles as support. The magnetic Fe3O4–CS nanoparticles were prepared by electrostatic adsorption of chitosan onto the surface of Fe3O4 nanoparticles made through co-precipitation of Fe2+ and Fe3+. The resultant material was characterized by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, vibrating sample magnetometry and thermogravimetric analysis. β-d-Galactosidase was covalently immobilized onto the nanocomposites using glutaraldehyde as activating agent. The immobilization process was optimized by examining immobilized time, cross-linking time, enzyme concentration, glutaraldehyde concentration, the initial pH values of glutaraldehyde and the enzyme solution. As a result, the immobilized enzyme presented a higher storage, pH and thermal stability than the soluble enzyme. Galactooligosaccharide was formed with lactose as substrate by using the immobilized enzyme as biocatalyst, and a maximum yield of 15.5% (w/v) was achieved when about 50% lactose was hydrolyzed. Hence, the magnetic Fe3O4–chitosan nanoparticles are proved to be an effective support for the immobilization of β-d-galactosidase." @default.
- W2092825009 created "2016-06-24" @default.
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- W2092825009 date "2009-12-01" @default.
- W2092825009 modified "2023-10-08" @default.
- W2092825009 title "Novel and efficient method for immobilization and stabilization of β-d-galactosidase by covalent attachment onto magnetic Fe3O4–chitosan nanoparticles" @default.
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- W2092825009 doi "https://doi.org/10.1016/j.molcatb.2009.07.003" @default.
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