Abstract
Immobilization of glycerol dehydrogenase (GDH) from Serratia marcescens H30 onto epoxy functional magnetic nanoparticles by covalent attachment was carried out. The optimal immobilization conditions were obtained as follows: enzyme/support 6.08 mg/g, temperature 25 °C, pH 7.0 and time 8 h. Under these conditions, a high immobilization yield above 90% was obtained. The characterization of the immobilized GDH indicated that enhanced pH and thermal stability were achieved. Kinetic parameters Km of free and immobilized GDH were determined as 10.35 mM and 15.76 mM, respectively. The immobilized GDH retained about 85% initial activity after ten cycles. These results suggested that GDH immobilized onto magnetic nanoparticles is a simple and efficient way for preparation of stable enzyme. And the immobilized GDH has potential applications in the production of DHA.
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