title: Specific high performance liquid chromatographic determination of quinidine in serum, blood, and urine.
abstract: A reversed-phase high performance liquid chromatographic method for determination of quinidine in serum, blood, and urine has been developed. An alkylnitrile column is used with a mobile phase of acetonitrile in an acetate buffer. The method was rigorously tested and shown to be specific for quinidine using the following methods: comparison of capacity factors among methanolic reference standards of quinidine, known metabolites, and 36 other drugs; comparison of the quinidine capacity factor with the capacity factors from components in patient sera and urines, from which quinidine was selectively removed by thin-layer chromatography; and, correlation of quinidine concentrations in patient sera using ultraviolet absorbance versus fluorescence detection. Application of the method to a single-dose pharmacokinetic study, including serum protein binding and blood/serum concentration ratio measurements.
mesh_terms: D001798:Blood Proteins / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D007202:Indicators and Reagents; D007700:Kinetics; D011485:Protein Binding; D011802:Quinidine / Q000032:analysis* / Q000097:blood / Q000652:urine; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001798:Blood Proteins; D007202:Indicators and Reagents; D011802:Quinidine