화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.12, No.1, 50-59, January, 2006
Hydroxypropyl-β-cyclodextrin Inclusion Complexes for Transdermal Delivery: Preparation, Inclusion Properties, Stability, and Release Behavior
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Hydroxypropyl-β-cyclodextrin (HPCD), a highly water-soluble derivative, was synthesized by the substitution of the hydroxyl groups in the glucopyranose units of β-cyclodextrin (β-CD) with hydroxypropyl groups to improve its solubility in aqueous solution and its biocompatibility. β-CD has only limited water solubility (~1.8 g/mL at ambient temperature), whereas HPCD showed high water solubility and also dissolved in solvents such as methanol, ethanol, DMF, and DMSO. To investigate their feasibility for transdermal delivery applications, HPCD inclusion complexes containing several lipophilic guest molecules (retinol, tocopherol, and genistein) were prepared through complex formation by taking advantage of the special molecular structure of HPCD, which has a hydrophobic interior cavity and a hydrophilic exterior. The molar inclusion efficiency of guest molecules within HPCD was ca. 8~12 % when the feed molar ratio of guest molecules to CD was 1. The inclusion efficiency was influenced by the feed molar ratio and by the type of guest molecule. The stabilities of the inclusion complexes were investigated with respect to the temperature, pH, and solvent. HPCD complexes exhibited enhanced stability in comparison with those of the parent β-CD. From an in vitro skin permeation study using a Frantz diffusion cells, ca. 70~90 % permeation of guest molecules was observed within 7 days.
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