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Estimation of physical stability of amorphous solid dispersion using differential scanning calorimetry

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Abstract

The physical stability of amorphous drug in solid dispersion was estimated using differential scanning calorimetry (DSC). Tolbutamide (TB) and flurbiprofen (FBP) were selected as insoluble drugs in water. Polyvinylpyrrolidone (PVP) was selected as a polymer for solid dispersion. Solid dispersions of various ratios of TB or FBP and PVP-K25 were prepared by solvent evaporation method and the induction period of crystallization from amorphous drug in solid dispersion was measured by DSC. Compared with FBP, the induction period of crystallization from TB was delayed by an addition of PVP. The improvement of the physical stability by the addition of PVP-K25 was estimated from the activation energy of diffusion of drug molecules and the interfacial free energy between drug crystal and supercooled liquid of drug in solid dispersion. From thses results, the hindrance of the diffusivity of the drug molecule might be mainly affected the delay of the induction period of crystallization of TB and FBP.

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Authors and Affiliations

  1. Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan, 274-8510, Miyama 2-2-1, Funabashi

    Yoshihashi Y., Iijima H., Yonemochi E. & Terada K.

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  1. Yoshihashi Y.
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  2. Iijima H.
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  3. Yonemochi E.
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  4. Terada K.
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Correspondence to Yoshihashi Y..

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Yoshihashi, Y., Iijima, H., Yonemochi, E. et al. Estimation of physical stability of amorphous solid dispersion using differential scanning calorimetry. J Therm Anal Calorim 85, 689–692 (2006). https://doi.org/10.1007/s10973-006-7653-8

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  • DOI: https://doi.org/10.1007/s10973-006-7653-8

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