Abstract
It is shown that the values of adsorption, the type of adsorption isotherms, and the catalytic activity and thermal stability of alkaline phosphatase on halloysite surfaces depend on the texture of aluminosilicate nanotubes. The maximum values of the limiting adsorption are obtained on samples with the smallest specific surface area (28 and 50 m2/g): 18 and 23 mg/g or 0.69 and 0.54 mg/m2, respectively. It is found that the adsorption layers of alkaline phosphatase on surfaces of halloysite are more stable than the enzyme in solution. The effective rate constants of inactivation at 59°С vary within 0–2.3 × 10−4 s−1 for heterogeneous samples. In solution at the optimum pH of enzyme stability, they are 12.5 × 10−4 s−1. The catalytic activity of the adsorption layers of alkaline phosphatase is no more than 1% of the activity of the native enzyme.
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Funding
Study of texture and morphology of halloysite samples was funded by the Russian Science Foundation (project no. 19-73-10160).
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Atyaksheva, L.F., Ibrahimzade, T.I., Kasyanov, I.A. et al. Adsorption and Catalytic Activity of Alakaline Phosphatase on Halloysite Surface. Russ. J. Phys. Chem. 95, 1449–1454 (2021). https://doi.org/10.1134/S0036024421070050
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DOI: https://doi.org/10.1134/S0036024421070050