title: Spectrofluorimetric study of host-guest complexation of ibuprofen with beta-cyclodextrin and its analytical application.
abstract: The characteristics of host-guest complexation between beta-cyclodextrin (beta-CD) and two forms of ibuprofen (protonated and deprotonated) were investigated by fluorescence spectrometry. 1:1 stoichiometries for both complexes were established and their association constants at different temperatures were calculated by applying a non-linear regression method to the change in the fluorescence of ibuprofen that brought about by the presence of beta-CD. The thermodynamic parameters (deltaH, deltaS and deltaG) associated with the inclusion process were also determined. Based on the obtained results, a sensitive spectrofluorimetric method for the determination of ibuprofen was developed with a linear range of 0.1-2 microg ml(-1) and a detection limit of 0.03 microg ml(-1). The method was applied satisfactorily to the determination of ibuprofen in pharmaceutical preparations.
authors.affiliation: Department of Analytical Chemistry, Tabriz University, Tabriz, Iran. manzoori@tabrizu.ac.ir
authors.forename: Jamshid L
authors.initials: JL
authors.lastname: Manzoori
authors.forename: Mohammad
authors.initials: M
authors.lastname: Amjadi
mesh_terms: D003505:Cyclodextrins / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007052:Ibuprofen / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D047392:beta-Cyclodextrins
chemical_list: D003505:Cyclodextrins; D047392:beta-Cyclodextrins; C031215:betadex; D007052:Ibuprofen