Section 9
Chapter 8,448

Determination of quinidine, dihydroquinidine, (3S) -3-hydroxyquinidine and quinidine N-oxide in plasma and urine by high-performance liquid chromatography

Nielsen, F.; Nielsen, K.K.; Brøsen, K.

Journal of Chromatography. B, Biomedical Applications 660(1): 103-110


ISSN/ISBN: 1572-6495
PMID: 7858702
DOI: 10.1016/0378-4347(94)00259-2
Accession: 008447588

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A specific and sensitive method for the quantitation of quinidine, (3S)-3-hydroxyquinidine, quinidine N-oxide, and dihydroquinidine in plasma and urine has been developed. The method is based on a single-step, liquid-liquid extraction procedure, followed by isocratic reversed-phase high-performance liquid chromatography, with fluorescence detection. After extraction from 250 microliters plasma and 100 microliters urine, the limit of determination is 10 nM and 25 nM, respectively. For the use as standards, commercially available quinidine was purified from dihydroquinidine; quinidine N-oxide was synthesized.

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