Simultaneous Determination of Felbamate, Primidone, Phenobarbital, Carbamazepine, Two Carbamazepine Metabolites, Phenytoin, and One Phenytoin Metabolite in Human Plasma by High-Performance Liquid Chromatography

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Abstract
An isocratic liquid-chromatographic method employing one extraction step has been developed for the quantitation of five drugs and three metabolites in human plasma. The method uses 0.100-ml aliquots of human plasma and two internal standards. Chromatographic conditions include a 4.6 mm x 150 mm Spherisorb ODS2, 3 microns a high-performance liquid chromatography, (HPLC) column, a phosphate buffer-acetonitrile-methanol (700:160:140) mobile phase, and ultraviolet (UV) absorbance detection at 210 nm. Analytes and linear quantitation ranges (microgram/ml) were felbamate (FBM) 0.391-200; primidone (PRIM), 0.098-100; phenobarbital (PHENO), 0.195-100; carbamazepine (CBZ), 0.195-100; phenytoin (PHT), 0.195-200. For CBZ-transdiol (CBZ-TR) CBZ-epoxide (CBZ-EP), and the PHT metabolite, 5-(4-hydroxyphenyl)-5-phenylhydantoin (HPPH), the range was 0.049-25.0 micrograms/ml. Ethosuximide, methsuximide, 2-methyl-2-phenyl-succinimide (methsuximide metabolite), 2-ethyl-2-phenyl malonamide (PRIM metabolite, 5-ethyl-5-(4-hydroxyphenyl)-barbituric acid (PHENO metabolite), and mephenytoin do not interfere with quantitation of the above compounds.

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