Add time:08/08/2019         Source:sciencedirect.com

Methods based on reversed-phase liquid chromatography with amperometric detection have been developed for determination of nitecapone, 3-(3,4-dihydroxy-5-nitrobenzylidene)-2,4-pentanedione, a COMT inhibitor, in human plasma and urine. Nitecapone was extracted with ethyl acetate—hexane mixtures from plasma after acidification with hydrochloric acid and from urine as the tetrabutylammonium ion-pair of its diphenylborate derivative. The recoveries of both methods exceeded 70% and the relative standard deviations for within-day precision were less than 4% and 8% at 50 ng ml−1 and at the quantitation limits, respectively. The methods are selective, sensitive and precise enough for determination of 4–5 ng ml−1 of nitecapone in plasma and urine and are thus suitable for the kind of pharmacokinetic studies exemplified in this paper.

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