title: Assay of free and total tocainide by high performance liquid chromatography (HPLC) with ultraviolet (UV) detection.
abstract: A rapid high performance liquid chromatographic (HPLC) method for the determination of tocainide, using N-(2,6-dimethylphenyl)-2-amino-butanimide as an internal standard, was developed. A methylene chloride extraction involving salting out at pH 9.0 was employed. An 85:15 mixture of 0.025M monobasic potassium phosphate at pH 3.0 and acetonitrile was used as the mobile phase. The separation and quantitative analysis of tocainide was performed on a mixed phase column with a 1.0-mL/min flow rate and detection at 210 nm. Separation of tocainide from some of its metabolites required the use of heptane sulfonic acid as an ion-pairing reagent. For the free-drug assay, the specimen was centrifuged through an Amicon Centrifree filter before being processed.
authors.affiliation: Department of Pathology, University of Texas Health Science Center, San Antonio.
authors.forename: S C
authors.initials: SC
authors.lastname: Harris
authors.forename: C
authors.initials: C
authors.lastname: Guerra
authors.forename: J E
authors.initials: JE
authors.lastname: Wallace
mesh_terms: D000889:Anti-Arrhythmia Agents / Q000097:blood*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006801:Humans; D008012:Lidocaine / Q000031:analogs & derivatives* / Q000097:blood; D013056:Spectrophotometry, Ultraviolet; D016677:Tocainide
chemical_list: D000889:Anti-Arrhythmia Agents; D016677:Tocainide; D008012:Lidocaine