Development and validation of a liquid chromatographic-tandem mass spectrometric method for determination of piperaquine in plasma stable isotope labeled internal standard does not always compensate for matrix effects

Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
N LindegardhN P J Day

Abstract

A bioanalytical method for the analysis of piperaquine in human plasma using off-line solid-phase extraction and liquid chromatography coupled to positive tandem mass spectroscopy has been developed and validated. It was found that a mobile phase with high pH (i.e. 10) led to better sensitivity than mobile phase combinations with low pH (i.e. 2.5-4.5) despite the use of positive electrospray and a basic analyte. The method was validated according to published FDA guidelines and showed excellent performance. The within-day and between-day precisions expressed as R.S.D., were lower than 7% at all tested concentrations (4.5, 20, 400 and 500ng/mL) and below 10% at the lower limit of quantification (LLOQ) (1.5ng/mL). The calibration range was 1.5-500ng/mL with a limit of detection (LOD) at 0.38ng/mL. Validation of over-curve samples ensured that it would be possible with dilution if samples went outside the calibration range. Matrix effects were thoroughly evaluated both graphically and quantitatively. Matrix effects originating from the sample clean-up (i.e. solid-phase extraction) procedure rather than the plasma background were responsible for the ion suppression seen in this study. Salts remaining from the buffers used in the so...Continue Reading

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Citations

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