Abstract
A sensitive and selective high-performance liquid chromatographic method for the determination of cabergoline in plasma and urine has been developed. After buffering plasma and urine samples, cabergoline was extracted with a methylene chloride—isooctane mixture, back-extracted into 0.1 M phosphoric acid, then analysed by reversed-phase high-performance liquid chromatography. Quantitation was achieved by electrochemical detection of the eluate. The linearity, precision and accuracy of the method were evaluated. No interference from the biological matrices (human plasma and urine) was observed. The assay was still inadequate in terms of sensitivity for the quantitation of cabergoline plasma concentrations after a single oral dose of 1 mg of the drug to humans, but was successfully used in the determination of the urinary excretion of the drug.
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