Interaction of sulfadiazine with cyclodextrins in aqueous solution and solid state
作者:Alicia Delrivo、Ariana Zoppi、Marcela Raquel Longhi
DOI:10.1016/j.carbpol.2011.10.025
日期:2012.2
The main objective of this work was to increase the solubility of sulfadiazine by formation of inclusion complexes with p-cyclodextrin, and methyl-beta-cyclodextrin. The apparent stability constants have been determined by phase solubility studies in water and buffer solutions of pH values of 2 and 8. The stoichiometry of all complexes was found to be 1:1 but different relative affinities were found for each cyclodextrin. It was possible to obtain a greater overall solubility by using a combined approach of pH adjustment and complexation with cyclodextrins. Guest-host interactions have been investigated using nuclear magnetic resonance. Complexes were prepared in solid state by different methods and were characterized using differential scanning calorimetry, thermogravimetric analysis. Fourier-transform infrared spectroscopy, X-ray diffractometry and scanning electron microscopy. The dissolution rate of the drug from the inclusion complex made by freeze-dried was much faster than this of the pure drug. (C) 2011 Elsevier Ltd. All rights reserved.