title: Identification and differentiation of alkylamine antihistamines and their metabolites in urine by computerized gas chromatography-mass spectrometry.
abstract: A gas chromatographic-mass spectrometric screening procedure is described for the identification and differentiation of the following alkylamine antihistamines and their metabolites in urine: azatadine, benzquinamide, brompheniramine, chlorphenamine, (clofedanol), cyproheptadine, dimetindene, ketotifen, mebhydroline, phenindamine, pheniramine, pyrrobutamine, terfenadine and tolpropamine. After acid hydrolysis of the conjugates, extraction and acetylation, the urine samples were analysed by computerized gas chromatography-mass spectrometry. Using ion chromatography with the selective ions m/z 58, 169, 203, 205, 230, 233, 262 and 337, the presence of alkylamine antihistamines and/or their metabolites was indicated. The identity of positive signals in the reconstructed ion chromatograms was confirmed by a visual or computerized comparison of the stored full mass spectra with the reference spectra. The ion chromatograms, reference mass spectra and gas chromatographic retention indices (OV-101) are documented. The procedure presented is integrated in a general screening procedure (general unknown analysis) for several groups of drugs.
authors.affiliation: Institut für Pharmakologie und Toxikologie der Universität des Saarlandes, Homburg/Saar, F.R.G.
authors.forename: H
authors.initials: H
authors.lastname: Maurer
authors.forename: K
authors.initials: K
authors.lastname: Pfleger
mesh_terms: D000107:Acetylation; D000738:Androsterone / Q000032:analysis; D000818:Animals; D008401:Gas Chromatography-Mass Spectrometry; D006634:Histamine H1 Antagonists / Q000032:analysis* / Q000652:urine; D006801:Humans; D006868:Hydrolysis; D051381:Rats
chemical_list: D006634:Histamine H1 Antagonists; D000738:Androsterone