title: Analysis of lamotrigine and its metabolites in human plasma and urine by micellar electrokinetic capillary chromatography.
abstract: A reliable micellar electrokinetic capillary chromatographic method was developed and validated for the determination of lamotrigine and its metabolites in human plasma and urine. The variation of different parameters, such as pH of the background electrolyte (BGE) and Sodium dodecyl sulfate (SDS) concentration, were evaluated in order to find optimal conditions. Best separation of the analytes was achieved using a BGE composed of 10 mM borate and 50 mM SDS, pH 9.5; melatonin was selected as the internal standard. Isolation of lamotrigine and its metabolites from plasma and urine was accomplished with an original solid-phase extraction procedure using hydrophilic-lypophilic balance cartridges. Good absolute recovery data and satisfactory precision values were obtained. The calibration plots for lamotrigine and its metabolites were linear over the 1-20 microg/mL concentration range. Sensitivity was satisfactory; the limits of detection and quantitation of lamotrigine were 500 ng/mL and 1 microg/mL, respectively. The application of the method to real plasma samples from epileptic patients under therapy with lamotrigine gave good results in terms of accuracy and selectivity, and in agreement with those obtained with an high-performance liquid chromatography (HPLC) method.
authors.affiliation: Department of Pharmaceutical Sciences, Faculty of Pharmacy, Alma Mater Studiorum - University of Bologna, Bologna, Italy.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Pucci
authors.affiliation: Department of Pharmaceutical Sciences, Faculty of Pharmacy, Alma Mater Studiorum - University of Bologna, Bologna, Italy.
authors.forename: Francesca
authors.initials: F
authors.lastname: Bugamelli
authors.affiliation: Laboratory of Clinical Pharmacology and Toxicology, Hospital of Ravenna, Ravenna, Italy.
authors.forename: Cesare
authors.initials: C
authors.lastname: Baccini
authors.affiliation: Department of Pharmaceutical Sciences, Faculty of Pharmacy, Alma Mater Studiorum - University of Bologna, Bologna, Italy.
authors.forename: Maria Augusta
authors.initials: MA
authors.lastname: Raggi
mesh_terms: D002851:Chromatography, High Pressure Liquid; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods*; D004827:Epilepsy / Q000188:drug therapy; D006801:Humans; D000077213:Lamotrigine; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014227:Triazines / Q000097:blood / Q000302:isolation & purification* / Q000378:metabolism / Q000627:therapeutic use / Q000652:urine
chemical_list: D014227:Triazines; D000077213:Lamotrigine