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Thermodynamics of β-cyclodextrin–ephedrine inclusion complex formation and covering of nanometric calcite with these substances

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Abstract

Isothermal titration calorimetry (ITC) has been used to characterize inclusion complex formation of β-cyclodextrin (β-CD) with ephedrine in aqueous solutions. ITC measurements were taken at 298.15 K on a MicroCal OMEGA ultrasensitive titration calorimeter (MicroCal Inc.). The experimental data were analyzed on the basis of the model of a single set of identical sites (ITC Tutorial Guide). Based on the experimental values of equilibrium constant (K) and enthalpy of complex formation (ΔH), the Gibbs energy of complex formation (ΔG), and the entropy of complex formation (ΔS), has been calculated. Obtained results showed that β-CD forms inclusion complex of stoichiometry 1:1 with ephedrine and the complex formation is entropy driven. Ephedrine and its complex with β-CD have been further used for covering of the obtained in a controlled way nanometric CaCO3 (calcite), which served as a solid supports for drug depositing. The calcite coating has been analyzed by the use of thermogravimetric method. The size of aggregates of pure calcite particles as well as CaCO3 particles covered by ephedrine and its complex with β-CD have been measured by DLS method. It has been found that pure CaCO3 aggregates are almost monodispersed with the mean diameter equal to 329 nm (±5 nm). Ephedrine and its complex with β-CD layers formed in situ on precipitated calcite surface prevented from crystallites aggregation and decreases particles mean diameter up to 274 nm (±5 nm) for ephedrine and 211 nm (±5 nm) for β-CD complex with ephedrine.

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  1. Faculty of Biology and Environmental Sciences, Cardinal Stefan Wyszynski University in Warsaw, Wóycickiego 1/3, 01-938, Warsaw, Poland

    Małgorzata Wszelaka-Rylik

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  1. Małgorzata Wszelaka-Rylik
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Correspondence to Małgorzata Wszelaka-Rylik.

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Wszelaka-Rylik, M. Thermodynamics of β-cyclodextrin–ephedrine inclusion complex formation and covering of nanometric calcite with these substances. J Therm Anal Calorim 127, 1825–1834 (2017). https://doi.org/10.1007/s10973-016-5467-x

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  • DOI: https://doi.org/10.1007/s10973-016-5467-x

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