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Physicochemical and thermodynamic characterization of hydroxy pentacyclic triterpenoic acid/γ-cyclodextrin inclusion complexes

Abstract : Hydroxy pentacyclic triterpenoic acids (HPTAs) have been described to exhibit numerous pharmacological properties. They also exhibit poor hydrosolubility, thus affecting their potential clinical interest. The association of these active substances with cyclodextrins could be employed to improve some properties such as bioavailability and activity. 1:1 Inclusion complexes of ursolic, oleanolic and betulinic acids with γ-cyclodextrin were evaluated by DSC and 1H NMR spectroscopy. The apparent formation constants (Kf) of the formed complexes were determined using RP-HPLC. Thermodynamic parameters ΔGº, ΔHº and ΔSº were calculated with temperatures ranging from 25 to 45 °C to evaluate the complexation process. Finally the influence of γ-CD on the HPTA water solubility was investigated by phase-solubility studies.
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https://hal.univ-lorraine.fr/hal-01650404
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Submitted on : Tuesday, November 28, 2017 - 1:45:18 PM
Last modification on : Friday, September 10, 2021 - 1:04:03 PM

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Stéphane Fontanay, Francine Kedzierewicz, Raphaël E. Duval, Igor Clarot. Physicochemical and thermodynamic characterization of hydroxy pentacyclic triterpenoic acid/γ-cyclodextrin inclusion complexes. Journal of Inclusion Phenomena and Macrocyclic Chemistry, Springer Verlag, 2012, 73 (1-4), pp.341 - 347. ⟨10.1007/s10847-011-0063-y⟩. ⟨hal-01650404⟩

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