alexa Quantification of paclitaxel metabolites in human plasma by high-performance liquid chromatography.
Pharmaceutical Sciences

Pharmaceutical Sciences

Pharmaceutica Analytica Acta

Author(s): Huizing MT, Sparreboom A, Rosing H, van Tellingen O, Pinedo HM,

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Abstract A reversed-phase high-performance liquid chromatographic (HPLC) method has been validated for the quantitative determination of the three major paclitaxel metabolites (6 alpha-hydroxypaclitaxel, 3'-p-hydroxypaclitaxel, 6 alpha,3'-p-dihydroxypaclitaxel) in human plasma. The HPLC system consists of an APEX-octyl analytical column and acetonitrile-methanol-0.02 M ammonium acetate buffer pH 5 (AMW; 4:1:5, v/v/v) as the mobile phase. Detection is performed by UV absorbance measurement at 227 nm. The sample pretreatment of the plasma samples involves solid-phase extraction (SPE) on Cyano Bond Elut columns. The concentrations of the metabolic products could be determined by using the paclitaxel standard curve with a correction factor of 1.14 for 6 alpha,3'-p-dihydroxypaclitaxel. The recoveries of paclitaxel and the metabolites 6 alpha,3'-p-dihydroxypaclitaxel, 3'-p-hydroxypaclitaxel and 6 alpha-hydroxypaclitaxel in human plasma were 89, 78, 91 and 89\%, respectively. The accuracy of the assay for the determination of paclitaxel and its metabolites varied between 95 and 97\%, at a 50 ng/ml analyte concentration. The lower limit of quantitation was 10 ng/ml for both the parent drug and its metabolites.
This article was published in J Chromatogr B Biomed Appl and referenced in Pharmaceutica Analytica Acta

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