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Imobilizace galaktosidasy a její využití v potravinářské technologii
Dobešová, Natálie
This master‘s thesis deals with the issue of galactosidase immobilization and its use in food technology. β-galactosidase from Kluyveromyces lactis was immo-bilized using two methods, specifically encapsulation and cross-linking. The aim of the encapsulation was to obtain hydrogel capsules formed by a biopolymer matrix based on sodium alginate, crosslinked with calcium chloride for repeated catalytic use. The second chosen method was the enzyme cross-linking on a carrier formed by mag-netic particles modified with chitosan. Enzyme activity was determined spectropho-tometrically using the substrate o-nitrophenyl-β-D-galactopyranoside and p-nitrophenol as a standard. Enzyme activity was evaluated in milk samples and the amount of lactose formed was determined polarimetrically. The experimental results showed that the immobilized enzyme on the chitosan magnetic carrier showed higher activity compared to the sys-tem based on alginate capsules, which was also confirmed during the lactose hydroly-sis process. Lactose hydrolysis was the most efficient using a commercial enzyme and the enzyme immobilized on magnetic chitosan. There was no statically significant difference in the lactose content in milk samples without enzyme and with the use of alginate calcium capsules.

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