Аннотация:The paper is devoted to characterization of BEA and MFI zeolite samples synthesized in alkaline and fluoride media. Using a number of synthesized and commercial samples, enzyme adsorption isotherms were recorded, specifically for Aspergillus oryzae β-galactosidase. The highest adsorption capacity (32–33 mg/g) was achieved on fine-crystalline (0.2–0.6 μm) MFI samples. The fine-crystalline BEA samples (0.3–1 and ˂0.1 μm) exhibited maximal adsorption capacities of 18 and 26 mg/g, respectively. The coarse-crystalline BEA and MFI zeolites prepared by fluoride synthesis reached a markedly lower enzyme adsorption capacity, not exceeding 6 mg/g. The NMR spectroscopy data indicate that the low adsorption capacity of the zeolites synthesized in fluoride media was not only owing to their crystal size but also to the low content of hydroxyl groups on their surface.
