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• W2069769979 abstract "A combined assay for the determination of paclitaxel, docetaxel and ritonavir in human plasma is described. The drugs were extracted from 200 μL human plasma using liquid–liquid extraction with tertiar-butylmethylether, followed by high performance liquid chromatography analysis using 10 mM ammonium hydroxide pH 10:methanol (3:7, v/v) as mobile phase. Chromatographic separation was obtained using a Zorbax Extend C18 column. Labelled analogues of the analytes are used as internal standards. For detection, positive ionization electrospray tandem mass spectrometry was used. Method development including optimisation of the mass transitions and response, mobile phase optimisation and column selection are discussed. The method was validated according to FDA guidelines and the principles of Good Laboratory Practice (GLP). The validated range was 0.5–500 ng/mL for paclitaxel and docetaxel and 2–2000 ng/mL for ritonavir. For quantification, quadratic calibration curves were used (r2 > 0.99). The total runtime of the method is 9 min and the assay combines analytes with differences in ionisation and desired concentration range. Inter-assay accuracy and precision were tested at four concentration levels and were within 10% and less than 10%, respectively, for all analytes. Carry-over was less than 6% and endogenous interferences or interferences between analytes and internal standards were less than 20% of the response at the lower limit of quantification level. The matrix factor and recovery were determined at low, mid and high concentration levels. The matrix factor was around 1 for all analytes and total recovery between 77.5 and 104%. Stability was investigated in stock solutions, human plasma, dry extracts, final extracts and during 3 freeze/thaw cycles. The described method was successfully applied in clinical studies with oral administration of docetaxel or paclitaxel in combination with ritonavir." @default.
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• W2069769979 date "2011-10-01" @default.
• W2069769979 modified "2023-10-09" @default.
• W2069769979 title "A sensitive combined assay for the quantification of paclitaxel, docetaxel and ritonavir in human plasma using liquid chromatography coupled with tandem mass spectrometry" @default.
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• W2069769979 doi "https://doi.org/10.1016/j.jchromb.2011.08.034" @default.
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