title: Determination of phenelzine in human plasma with gas chromatography-mass spectrometry using an isotope labeled internal standard.
abstract: A quantitative gas chromatographic-mass spectrometric assay was developed for the determination of phenelzine in human plasma. Phenelzine, in aqueous solution or in plasma reacts at room temperature with pentafluorobenzaldehyde to form quantitatively a hydrazone derivative. The derivative has good gas chromatographic characteristics. The assay utilizes selected ion monitoring in a gas chromatographic effluent, the molecular ion generated by electron impact ionization of phenelzine derivative. Phenelzine-d, was synthesized and used as an internal standard. The assay can measure 2 ng/ml of the drug with about 10% precision. The method was used for the determination of steady state levels of phenelzine in the plasma of patients taking a therapeutic dose of the drug.
mesh_terms: D003903:Deuterium; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006801:Humans; D007477:Ions; D010624:Phenelzine / Q000097:blood*; D012015:Reference Standards
chemical_list: D007477:Ions; D003903:Deuterium; D010624:Phenelzine