title: Determination of lamotrigine in human plasma by high-performance liquid chromatography.
abstract: The method involves precipitation of plasma proteins with acetonitrile and analysis of the supernatant by high-performance liquid chromatography using a 5 microm Zorbax C8 column. Quantitation was performed by measurement of the UV absorbance at a wavelength of 306 nm. The method was linear in the range of 1-20 microg/ml, with a mean coefficient of determination (r2=0.998). The limit of detection was 0.6 microg/ml and the lower limit of quantitation was 1 microg/ml using 200 microl of plasma. Within- and between-day accuracy and precision were below 6% at all analysed concentrations except at the limit of quantitation. No interfering peaks were found by commonly monitored antiepileptic drugs. Recovery was found to be > or =99%. Satisfactory performance was obtained in the evaluation of epileptic patient samples, whose results of plasma concentration measurements are briefly discussed. We conclude that this is a reliable method for the routine monitoring of lamotrigine concentration in plasma in the clinical setting.
authors.affiliation: Australian Centre for Clinical Neuropharmacology, St. Vincent's Hospital, Fitzroy, Victoria, Australia.
authors.forename: P
authors.initials: P
authors.lastname: Angelis-Stoforidis
authors.forename: D J
authors.initials: DJ
authors.lastname: Morgan
authors.forename: T J
authors.initials: TJ
authors.lastname: O'Brien
authors.forename: F J
authors.initials: FJ
authors.lastname: Vajda
mesh_terms: D000328:Adult; D000927:Anticonvulsants / Q000097:blood*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005260:Female; D006801:Humans; D000077213:Lamotrigine; D008297:Male; D008875:Middle Aged; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet; D014227:Triazines / Q000097:blood*
chemical_list: D000927:Anticonvulsants; D014227:Triazines; D000077213:Lamotrigine