Publication: Application of intermolecular spaces between polyethylene glycol/γ-cyclodextrin-polypseudorotaxanes as a host for various guest drugs
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Issued Date
2014-06-04
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ISSN
15287505
15287483
15287483
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2-s2.0-84901940838
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Mahidol University
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SCOPUS
Bibliographic Citation
Crystal Growth and Design. Vol.14, No.6 (2014), 2773-2781
Suggested Citation
Kenjirou Higashi, Haruka Waraya, Looi Kae Lin, Sachie Namiki, Marina Ogawa, Waree Limwikrant, Keiji Yamamoto, Kunikazu Moribe Application of intermolecular spaces between polyethylene glycol/γ-cyclodextrin-polypseudorotaxanes as a host for various guest drugs. Crystal Growth and Design. Vol.14, No.6 (2014), 2773-2781. doi:10.1021/cg401934v Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/33622
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Application of intermolecular spaces between polyethylene glycol/γ-cyclodextrin-polypseudorotaxanes as a host for various guest drugs
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Abstract
Eleven guest drugs with planar structures were incorporated into the intermolecular spaces between polyethylene glycol/γ-cyclodextrin (γ-CD)-polypseudorotaxanes by a sealed-heating method. Drug incorporation changed the crystal packing of γ-CD from hexagonal- to monoclinic-columnar forms, without dependence on the guest species. The incorporation of guest drugs was size dependent and stoichiometric. Guest drugs with one benzene ring and maximum cross sectional areas of ca. 40-55 Å2exhibited a drug to γ-CD stoichiometry of 2:1. Meanwhile, the stoichiometry was 1:1 for drugs with 2-3 benzene rings and maximum cross sectional areas of ca. 60-75 Å2. More sterically bulky drugs (four and five benzene rings) did form complexes, though the complexation efficiency was insufficient to form stoichiometric complexes, due to steric hindrance. The volume of intermolecular space of the host was estimated to be larger than that of a β-CD cavity and as large as that of a γ-CD cavity. Hydrophobic and van der Waals interactions worked as driving forces for the complexation because polycyclic aromatic hydrocarbons with high log P values formed the complex. The dissolution property of the hydrophobic pharmaceutical drug naproxen was clearly improved by the complexation because naproxen existed in a monomolecular state in the complex. © 2014 American Chemical Society.