The mechanism of catalase loading into porous vaterite CaCO3 crystals by co-synthesis

Vikulina, A.S.; Feoktistova, N.A.; Balabushevich, N.G.; Skirtach, A.G.; Volodkin, D.

Авторы: Vikulina A.S., Feoktistova N.A., Balabushevich N.G., Skirtach A.G., Volodkin D.
Журнал: Physical Chemistry Chemical Physics
Том: 20
Год издания: 2018
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
Первая страница: 8822
Последняя страница: 8831
DOI: 10.1039/c7cp07836f
Аннотация: Porous vaterite CaCO3 crystals are nowadays extensively used as high-capacity bio-friendly sacrificial templates for the fabrication of such protein-containing nano- and micro-particles as capsules and beads. The first step in the protein encapsulation is performed through loading of the protein molecules into the crystals. Co-synthesis is one of the most useful and simple methods proven to effectively load crystals with proteins; however, the loading mechanism is still unknown. To understand the mechanism,in this study, we focus on the loading of a model protein catalase into the crystals by means of adsorption into pre-formed crystals (ADS) and co-synthesis (COS). Analysis of the physico-chemical characteristics of the protein in solution and during the loading and simulation of the protein packing into the crystals are performed. COS provides more effective loading than ADS giving protein contents in the crystals of 20.3 and 3.5 w/w%, respectively. Extremely high loading for COS providing a local protein concentration of about 550 mg mL1 is explained by intermolecular protein interactions, i.e.formation of protein aggregates induced by CaCl2 during the co-synthesis. This is supported by a lower equilibrium constant obtained for COS (5 105 M1) than for ADS (23 105 M1), indicating a higher affinity of single protein molecules rather than aggregates to the crystal surface. Fitting the adsorption isotherms by classical adsorption models has shown that the Langmuir and BET models describe the adsorption phenomenon better than the Freundlich model, proving the aggregation in solution followed by adsorption of the aggregates into the crystals. We believe that this study will be useful for protein encapsulation through CaCO3 crystals using the COS method.
Добавил в систему: Балабушевич Надежда Георгиевна

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The mechanism of catalase loading into porous vaterite CaCO3 crystals by co-synthesisстатья Исследовательская статья

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