title: High-performance liquid chromatographic-tandem mass spectrometric method for the determination of ethionamide in human plasma, bronchoalveolar lavage fluid and alveolar cells.
abstract: We have developed and validated an accurate, sensitive, and rapid high-performance liquid chromatographic-tandem mass spectrometric method (HPLC-MS-MS) for the determination of ethionamide in plasma, bronchoalveolar fluid (BAL) and alveolar cells (AC). The retention times for ethionamide, clemastine fumarate (internal standard for plasma), promethazine (internal standard for plasma) and propranolol (internal standard for BAL and AC) were approximately 2.62, 1.21, 2.14, and 2.22 min, respectively, with a total run time of 3.2 min. Ethionamide detection for plasma was carried out on a PE Sciex API III (Perkin-Elmer, Foster City, CA, USA). BAL and cell pellets and some plasma specimens were analyzed on a Micromass Quattro LC (Micromass Co., Manchester, UK). The detection limits for ethionamide were 0.05 microg/ml for plasma, and 0.005 microg/ml for BAL supernatants and alveolar cell suspensions.
authors.affiliation: Department of Epidemiology and Biostatistics, University of California, San Francisco, 94117, USA. jconte@aids2.ucsf.edu
authors.forename: J E
authors.initials: JE
authors.lastname: Conte
authors.forename: G
authors.initials: G
authors.lastname: Wang
authors.forename: E T
authors.initials: ET
authors.lastname: Lin
authors.forename: E
authors.initials: E
authors.lastname: Zurlinden
mesh_terms: D000995:Antitubercular Agents / Q000032:analysis* / Q000097:blood; D001992:Bronchoalveolar Lavage Fluid; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005000:Ethionamide / Q000032:analysis* / Q000097:blood; D013058:Mass Spectrometry / Q000379:methods*; D011650:Pulmonary Alveoli / Q000737:chemistry*; D012015:Reference Standards; D015203:Reproducibility of Results
chemical_list: D000995:Antitubercular Agents; D005000:Ethionamide