Preparation and characterization of simvastatin/hydroxypropyl-β-cyclodextrin inclusion complex using supercritical antisolvent (SAS) process

Seoung Wook Jun, Min Soo Kim, Jeong Soo Kim, Hee Jun Park, Sibeum Lee, Jong Soo Woo, Sung Joo Hwang

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225 Citations (Scopus)


In the present study, the practically insoluble drug, simvastatin (SV), and its inclusion complex with hydroxypropyl β-cyclodextrin (HP-β-CD) prepared using supercritical antisolvent (SAS) process were investigated to improve the aqueous solubility and the dissolution rate of drug, thus enhancing its bioavailability. Inclusion complexation in aqueous solution and solid state was evaluated by the phase solubility diagram, differential scanning calorimetry (DSC), powder X-ray diffractometry (PXRD), Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The phase solubility diagram with HP-β-CD was classified as AL-type at all temperatures investigated, indicating the formation of 1:1 stoichiometric inclusion complex. The apparent complexation constants (K1:1) calculated from phase solubility diagram were 774, 846 and 924 M-1 at 25, 37 and 45 ± 0.5 °C, respectively. No endothermic and characteristic diffraction peaks corresponding to SV was observed for the inclusion complex in DSC and PXRD. FT-IR study demonstrated the presence of intermolecular hydrogen bonds between SV and HP-β-CD in inclusion complex, resulting in the formation of amorphous form. Aqueous solubility and dissolution studies indicated that the dissolution rates were remarkably increased in inclusion complex, compared with the physical mixture and drug alone. Moreover, SV/HP-β-CD inclusion complex performed better than SV in reducing total cholesterol and triglyceride levels. This could be primarily attributed to the improved solubility and dissolution associated with inclusion complex between drug and HP-β-CD. In conclusion, SAS process could be a useful method for the preparation of the inclusion complex of drug with HP-β-CD and its solubility, dissolution rate and hypolipidemic activity were significantly increased by complexation between SV and HP-β-CD.

Original languageEnglish
Pages (from-to)413-421
Number of pages9
JournalEuropean Journal of Pharmaceutics and Biopharmaceutics
Issue number3
Publication statusPublished - 2007 Jun

Bibliographical note

Funding Information:
This work was supported by National Research Laboratory Program (M1-0300-00-0157) and by the Energy Conservation Technology Program (2004-E-ID12-P-05-3-010).

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Pharmaceutical Science


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