title: Simultaneous determination of serum flecainide and its metabolites by using high performance liquid chromatography.
abstract: Simultaneous determination of serum flecainide and its oxidative metabolites was carried out by using high performance liquid chromatography (HPLC) equipped with conventional octadecylsilyl silica (ODS) column and fluorescence detector. Flecainide and its metabolites, m-O-dealkylated flecainide (MODF) and m-O-dealkylated lactam of flecainide (MODLF) in serum were extracted with ethyl acetate. The recoveries of flecainide, MODF and MODLF were greater than 92, 93, and 60% with the coefficient of variations (CVs) less than 3.2, 5.8, and 5.3%, respectively. The calibration curves were linear at the concentration range of 50-1500 ng/mL for flecainide and 10-500 ng/mL for MODF and MODLF (r > 0.999). The CVs for intra-day assay were 2.7-5.3% for flecainide, 3.0-4.2% for MODF, and 3.7-4.3% for MODLF, respectively. The CVs for inter-day assay were 7.0-8.4% for flecainide, 3.3-6.7% for MODF, and 4.4-7.7% for MODLF, respectively. This assay method can be used for assessing the metabolic ability of flecainide in the patients with tachyarrhythmia.
authors.affiliation: Department of Pharmaceutical Sciences, Institute of Clinical Medicine, University of Tsukuba, Ten-nodai 1-1-1, Tsukuba, Ibaraki 305-8575, Japan.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Doki
authors.forename: Masato
authors.initials: M
authors.lastname: Homma
authors.forename: Keisuke
authors.initials: K
authors.lastname: Kuga
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Watanabe
authors.forename: Iwao
authors.initials: I
authors.lastname: Yamaguchi
authors.forename: Yukinao
authors.initials: Y
authors.lastname: Kohda
mesh_terms: D000328:Adult; D000889:Anti-Arrhythmia Agents / Q000097:blood; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation; D005260:Female; D005424:Flecainide / Q000031:analogs & derivatives / Q000097:blood* / Q000493:pharmacokinetics; D006801:Humans; D008297:Male; D015394:Molecular Structure; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000889:Anti-Arrhythmia Agents; D005424:Flecainide