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Abstract
An isocratic, high-performance liquid chromatography method has been developed for simultaneous determination of the oral antidiabetic tolbutamide and two of its metabolites, 4-hydroxytolbutamide and carboxytolbutamide, in human plasma and urine. The method was based on simple one-step liquid-liquid extraction with tertiary-butyl methyl ether as extraction solvent. The chromatographic eluent was 23:77 (v/v) methanol: 0.01 M aqueous sodium acetate buffer pH 3.0, and the UV detection was performed at a wavelength of 230 nm. The limit of detection was 0.1 microM for tolbutamide in plasma and 1.5 microM, 0.5 microM, and 0.75 microM for carboxytolbutamide, 4-hydroxytolbutamide, and tolbutamide, respectively, in urine. The limit of quantitation was 0.5 micro for tolbutamide in plasma and 2 microM, 0.75 microM, and 1.25 microM for carboxytolbutamide, 4-hydroxytolbutamide, and tolbutamide, respectively, in urine. The overall mean recoveries ranged from 91% to 109% for tolbutamide in plasma and from 80% to 98% in urine for all three compounds.
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