Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2017-07-01

Journal: CURRENT DRUG DELIVERY

Included Journals: Scopus、PubMed、SCIE

Volume: 14

Issue: 8

Page Number: 1130-1143

ISSN: 1567-2018

Key Words: Poorly water-soluble drug; solubilization; inclusion complex; 2-hydroxypropyl-beta-cyclodextrin; meglumine; scanning electron microscope (SEM)

Abstract: Background: The solubilization of poorly water-soluble drugs remains challenging. The purpose of this study was to design a liquid formulation that can improve the solubility of poorly water-soluble and weakly acidic ST-246, an anti-smallpox drug.& para;& para;Methods: Soluble ternary cyclodextrin complexations (t-CDs) containing ST-246, 2-hydroxypropyl-beta-cyclodextrin (HP-beta-CD) and meglumine (MEG) were prepared and optimized. The optimized t-CDs were further characterized using a scanning electron microscope (SEM), Powder X-ray Difffactometry (PXRD), Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR) and Nuclear Magnetic Resonance Spectroscopy (NMR).& para;& para;Results: The solubility of ST-246 improved dramatically from 3 mu g/ml (in water, 37 degrees C) to 50 mg/ml in the optimized t-CDs (ST-246/MEG/HP-beta-CD, 1:2:6 weight ratio). The results suggested that the drug was associated with MEG through hydrogen bonds and then included into the hydrophobic cavity of HP-beta-CD, which might be a major factor for solubility improvement. To determine the exact inclusion mechanism, a Phase Soluble Study (PSS) was also conducted, and it indicated that a 1:1 soluble complex was formed between ST-246 and HP-beta-CD and that the action mechanism of MEG was complicated and relied on more than pH modulation.& para;& para;Conclusion: Generally, the optimized ternarycyclodextrin complexation might be a potential formulation strategy for enhancing the solubility and bioavailability of poorly water-soluble ST-246.