title: High-performance liquid chromatographic determination of pirprofen and five of its metabolites in human plasma without hydrolysis and in human urine before and after chemical hydrolysis.
abstract: Selective high-performance liquid chromatographic methods for the simultaneous determination of pirprofen and five of its metabolites either in plasma or in urine before and after chemical hydrolysis were developed. After addition of an internal standard and a buffer, the compounds were extracted from plasma using reversed-phase C18 Bond-Elut columns and from urine using pre-packed silica Extrelut 1 columns, back-extraction into sodium hydroxide and acidification of the alkaline phase before injection. Pirprofen, its five metabolites and the internal standard were separated using a linear elution gradient chromatographic system and wavelength programming. The analysis of spiked samples demonstrated the good accuracy and precision of the methods with limits of quantitation of 100 or 200 ng/ml for the different compounds in plasma, 200 or 360 ng/ml in urine without hydrolysis and 1 or 1.8 micrograms/ml in urine after chemical hydrolysis.
authors.affiliation: Laboratoires Ciba-Geigy, Biopharmaceutical Research Centre, Rueil-Malmaison, France.
authors.forename: A
authors.initials: A
authors.lastname: Sioufi
authors.forename: F
authors.initials: F
authors.lastname: Marfil
authors.forename: J
authors.initials: J
authors.lastname: Richard
authors.forename: D
authors.initials: D
authors.lastname: Colussi
authors.forename: J P
authors.initials: JP
authors.lastname: Dubois
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D006868:Hydrolysis; D010666:Phenylpropionates / Q000097:blood / Q000378:metabolism* / Q000652:urine
chemical_list: D010666:Phenylpropionates; C008924:pirprofen