Journal
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
Volume 34, Issue 2, Pages 333-339Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0731-7085(03)00529-6
Keywords
quercetin; cyclodextrin; drug solubilization; stability constant; differential scanning calorimetry; Fourier transform infrared spectroscopy; X-ray diffractometry; scanning electron microscopy
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The inclusion behavior of 2-hydroxypropyl beta-cyclodextrin (HPbetaCD) and P-cyclodextrin (betaCD), in solution and solid-state was studied towards a poorly water-soluble bioflavonoid, quercetin (QURC), chemically 3,3',4',5',7-pentahydroxy flavone. Drug-cyclodextrin solid systems were prepared by freeze-drying. Phase solubility study was used to evaluate the complexation in solution, of two cyclodextrins, i.e., betaCD and HPbetaCD. The stoichiometry and stability constants of QURC-betaCD (1: 1 and 402 M-1) and QURC-HPbetaCD (1:1 and 532 M-1) complexes were calculated by phase solubility method. The formation of inclusion complexes with betaCD and HPbetaCD in the solid-state were confirmed by infrared spectroscopy, differential scanning calorimetry, X-ray diffractornetry, and scanning electron microscopy (SEM). (C) 2003 Elsevier B.V. All rights reserved.
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