Physicochemical characterization of D-mannitol polymorphs: The challenging surface energy determination by inverse gas chromatography in the infinite dilution region

Abstract : Nowadays, it is well known that surface interactions play a preponderant role in mechanical operations, which are fundamental in pharmaceutical processing and formulation. Nevertheless, it is difficult to correlate surface behaviour in processes to physical properties measurement. Indeed, most pharmaceutical solids have multiple surface energies because of varying forms, crystal faces and impurities contents or physical defects, among others. In this paper, D-mannitol polymorphs (alpha, beta and delta) were studied through different characterization techniques highlighting bulk and surface behaviour differences. Due to the low adsorption behaviour of b and d polymorphs, special emphasis has been paid to surface energy analysis by inverse gas chromatography, IGC. Surface energy behaviour has been studied in Henry's domain showing that, for some organic solids, the classical IGC infinite dilution zone is never reached. IGC studies highlighted, without precedent in literature, dispersive surface energy differences between a and b mannitol, with a most energetically active a form with a gamma(d)(s) of 74.9 mJ.m(-2). Surface heterogeneity studies showed a highly heterogeneous a mannitol with a more homogeneous beta (40.0 mJ.m(-2)) and delta mannitol (40.3 mJ.m(-2)). Moreover, these last two forms behaved similarly considering surface energy at different probe concentrations. (C) 2014 Elsevier B. V. All rights reserved.
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Article dans une revue
International Journal of Pharmaceutics, Elsevier, 2014, 475 (1-2), p. 69-81. 〈http://www.sciencedirect.com/science/article/pii/S037851731400595X〉. 〈10.1016/j.ijpharm.2014.08.029〉
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https://hal.archives-ouvertes.fr/hal-01611996
Contributeur : Mines Albi Ecole Nationale Supérieure Des Mines d'Albi-Carmaux <>
Soumis le : vendredi 6 octobre 2017 - 13:32:43
Dernière modification le : lundi 6 août 2018 - 16:09:23

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María Graciela Cares Pacheco, G. Vaca-Medina, Rachel Calvet, Fabienne Espitalier, Jean‐jacques Letourneau, et al.. Physicochemical characterization of D-mannitol polymorphs: The challenging surface energy determination by inverse gas chromatography in the infinite dilution region. International Journal of Pharmaceutics, Elsevier, 2014, 475 (1-2), p. 69-81. 〈http://www.sciencedirect.com/science/article/pii/S037851731400595X〉. 〈10.1016/j.ijpharm.2014.08.029〉. 〈hal-01611996〉

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