title: Improving of catalase stability properties by encapsulation in alginate/Fe3O4 magnetic composite beads for enzymatic removal of H2O2.
abstract: The aim of this study was enhancing of stability properties of catalase enzyme by encapsulation in alginate/nanomagnetic beads. Amounts of carrier (10-100 mg) and enzyme concentrations (0.25-1.5 mg/mL) were analyzed to optimize immobilization conditions. Also, the optimum temperature (25-50°C), optimum pH (3.0-8.0), kinetic parameters, thermal stability (20-70°C), pH stability (4.0-9.0) operational stability (0-390 min), and reusability were investigated for characterization of the immobilized catalase system. The optimum pH levels of both free and immobilized catalase were 7.0. At the thermal stability studies, the magnetic catalase beads protected 90% activity, while free catalase maintained only 10% activity at 70°C. The thermal profile of magnetic catalase beads was spread over a large area. Similarly, this system indicated the improving of the pH stability. The reusability, which is especially important for industrial applications, was also determined. Thus, the activity analysis was done 50 times in succession. Catalase encapsulated magnetic alginate beads protected 83% activity after 50 cycles.
authors.affiliation: a Chemistry Department, Faculty of Science , Muğla Sıtkı Koçman University , Muğla , Turkey.
authors.forename: Yasemin Ispirli
authors.initials: YI
authors.lastname: Doğaç
authors.forename: Mürvet
authors.initials: M
authors.lastname: Çinar
authors.forename: Mustafa
authors.initials: M
authors.lastname: Teke
mesh_terms: D000464:Alginates / Q000737:chemistry*; D002374:Catalase / Q000737:chemistry*; D004800:Enzymes, Immobilized / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006358:Hot Temperature; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics
chemical_list: D000464:Alginates; D004800:Enzymes, Immobilized; D005290:Ferric Compounds; D006603:Hexuronic Acids; C000499:ferric oxide; D020723:Glucuronic Acid; D006861:Hydrogen Peroxide; D002374:Catalase
keywords: Fe3O4 nanoparticles; H2O2; catalase immobilization; magnetic alginate composite beads; stability