title: Identification and differentiation of beta-blockers and their metabolites in urine by computerized gas chromatography-mass spectrometry.
abstract: A method for the identification and differentiation of beta-blockers and their metabolites in urine after acid hydrolysis is described. The acetylated extract is analysed by computerized gas chromatography-mass spectrometry. An on-line computer allows rapid detection using ion chromatography with the ions of m/z 72, 86, 98, 140, 151, 159, 200 and 335. The identity of positive signals in the reconstructed ion chromatogram is confirmed by a comparison of the stored entire mass spectra with the reference spectra. The ion chromatogram, the reference mass spectra and the gas chromatographic retention indices (OV-101) are documented. References for the quantitation of the single beta-blockers are cited.
mesh_terms: D000107:Acetylation; D000319:Adrenergic beta-Antagonists / Q000652:urine*; D000818:Animals; D001711:Biotransformation; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D006868:Hydrolysis; D051381:Rats
chemical_list: D000319:Adrenergic beta-Antagonists