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Evaluation of actarit/γ-cyclodextrin complex prepared by different methods

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Journal of Inclusion Phenomena and Macrocyclic Chemistry Aims and scope Submit manuscript

Abstract

This study used actarit (ACT), an antirheumatic drug, to examine the molecular interaction of ACT and γ-CD in a solid state as a result of cogrinding or freeze-drying and it assessed the dissolution of ACT. Differential scanning calorimetry revealed that coground ACT and γ-CD at molar ratios of 1:2 and 1:3 and freeze-dried ACT and γ-CD at molar ratios of 1:1 and 1:2 lacked an endothermic peak due to melting of ACT crystals. Thus, coground ACT and γ-CD at a molar ratio of 1:2 had molecular interaction, as did freeze-dried ACT and γ-CD at a molar ratio of 1:1. Powder x-ray diffraction revealed that coground and humidified ACT and γ-CD at a molar ratio of 1:2 produced a characteristic diffraction peak at 2θ = 15.2° and 16.5° due to the cage structure of γ-CD. In addition, freeze-dried ACT and γ-CD at a molar ratio of 1:1 that had been humidified produced a diffraction peak at 2θ = 6.0° and 15.9° characteristic of a hexagonal structure with head-to-head channels due to γ-CD. Assessment of dissolution revealed that ground mixtures (GMs) and freeze-dried mixtures had improved dissolution of ACT compared to ACT, ground ACT alone, and physical mixtures. The mechanism for this is presumably the result of molecular interaction in a solid state or molecular interaction in an aqueous solution. 1H–1H NOESY NMR spectra suggested that in a GM of ACT and γ-CD the benzene ring and methyl group of ACT partially enter the CD cavity. In addition, spectra for freeze-dried ACT and γ-CD suggested that protons of the methylene group of ACT and the benzene ring of ACT partially enter the CD cavity. These findings indicate that ACT and γ-CD inclusion complexes feature different forms of inclusion depending on how they are prepared, e.g., cogrinding or freeze-drying. Findings also indicated that selection of a method of preparation may play a major role in drug development.

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Acknowledgments

The authors wish to thank Cyclo Chem Co. Ltd. for providing γ-CD. The authors also wish to sincerely thank Nippon Shinyaku Corporation for providing ACT.

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Authors and Affiliations

  1. Laboratory of Drug Safety Management, Faculty of Pharmaceutical Sciences, Josai University, 1-1, Keyakidai, Sakado-shi, Saitama, 350-0295, Japan

    Yutaka Inoue, Shota Watanabe, Rina Suzuki, Isamu Murata & Ikuo Kanamoto

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  1. Yutaka Inoue
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  2. Shota Watanabe
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  3. Rina Suzuki
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  4. Isamu Murata
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  5. Ikuo Kanamoto
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Correspondence to Yutaka Inoue.

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Inoue, Y., Watanabe, S., Suzuki, R. et al. Evaluation of actarit/γ-cyclodextrin complex prepared by different methods. J Incl Phenom Macrocycl Chem 81, 161–168 (2015). https://doi.org/10.1007/s10847-014-0445-z

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  • DOI: https://doi.org/10.1007/s10847-014-0445-z

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