title: Spectrophotometric determination of clobetasol propionate, halobetasol propionate, quinagolide hydrochloride, through charge transfer complexation.
abstract: Two spectrophotometric procedures are described for the determination of clobetasol propionate(I), halobetasol propionate(II) (corticosteroids) and quinagolide hydrochloride(III) (prolactin inhibitor). For corticosteroid drugs, the procedures are based on the formation of phenyl hydrazones of the corticosteroids which are subsequently subjected to charge transfer complexation reaction with either 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) as pi-acceptor or with iodine as sigma-acceptor. Prolactin inhibitor was reacted directly with the previous reagents. The molar ratios of the reactants were established and the experimental conditions were studied giving maximum absorption at 588 and 290 nm with DDQ and iodine methods, respectively for the three drugs. The concentration ranges were 20-150,50-300, and 20-80 microg ml(-1) in DDQ method for (I), (II), and (III), respectively and 13-20,15-40, and 8-32 microg ml(-1) in iodine method for (I), (II) and (III), respectively.
authors.affiliation: Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt.
authors.forename: Azza A
authors.initials: AA
authors.lastname: Mostafa
authors.forename: Lories I
authors.initials: LI
authors.lastname: Bebawy
authors.forename: Heba H
authors.initials: HH
authors.lastname: Refaat
mesh_terms: D000634:Aminoquinolines / Q000032:analysis*; D002990:Clobetasol / Q000031:analogs & derivatives* / Q000032:analysis*; D004355:Drug Stability; D012680:Sensitivity and Specificity; D013053:Spectrophotometry
chemical_list: D000634:Aminoquinolines; C046650:quinagolide; C064466:halobetasol; D002990:Clobetasol