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New methods of obtaining products containing enzymes reduce the costs associated with obtaining them, increase the efficiency of processes and stabilize the created biocatalytic systems. In the study a catalytic system containing the enzyme α-amylase immobilized on ZnO nanoparticle and Fe 3 O 4  nanoparticles was created. The efficiency of the processes was obtained with variables: concentrations of enzymes, temperatures and times, to define the best conditions for running the process, for which were determined equilibrium and kinetics of adsorption. The most effective parameters of α-amylase immobilization on metal oxides were determined, obtaining 100.8 mg/g sorption capacity for ZnO and 102.9 mg/g for Fe 3 O 4  nanoparticles. Base on the best parameters, ZnO-α-amylase was investigated as an antimicrobial agent and Fe 3 O 4 -α-amylase was tested as a catalyst in the process of starch hydrolysis. As a result of the conducted experiments, it was found that α-amylase immobilized on Fe 3 O 4  nanoparticles maintained high catalytic activity (the reaction rate constant K M  = 0.7799 [g/dm 3 ] and the maximum reaction rate V max  = 8.660 [g/(dm 3 min)]).

Catalytic and antimicrobial properties of α-amylase immobilised on the surface of metal oxide nanoparticles