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  • Title: Determination of alprostadil in rat plasma by ultra performance liquid chromatography-electrospray ionization-tandem mass spectrometry after intravenous administration.
    Author: Lin X, Zhang Y, Cui Y, Wang L, Wang J, Tang X.
    Journal: J Pharm Biomed Anal; 2009 May 01; 49(4):983-8. PubMed ID: 19217739.
    Abstract:
    A rapid, highly selective ultra performance liquid chromatography-electrospray ionisation-tandem mass spectrometry method (UPLC-ESI-MS/MS) was developed and validated for the determination and pharmacokinetic investigation of alprostadil in rat plasma. After a simple sample preparation procedure involving a one-step liquid-liquid extraction, alprostadil and the internal standard, diphenhydramine, were chromatographed on an ACQUITY UPLC BEH C(18) column with gradient elution using a mobile phase consisting of acetonitrile and water (containing 0.1% formic acid) at a flow rate of 0.25 mL min(-1). The detection was performed on a triple quadrupole tandem mass spectrometer in multiple reaction monitoring (MRM) mode via an electrospray ionization (ESI) source. The calibration curve was linear (r(2)=0.99) over the concentration range 0.4-250.0 ng mL(-1), with a lower limit of quantification of 0.4 ng mL(-1) for alprostadil. The inter- and intra-day precision (%R.S.D.) was less than 8.5% and 2.4%, respectively, and the accuracy (RE%) was between 9.3% and 1.0% (n=6). Alprostadil in rat plasma was stable when stored at room temperature for 0.5h and at -20 degrees C for two weeks. The method was very rapid, simple and reliable, and was employed for the first time for the pharmacokinetic studies of alprostadil in rats after a single intravenous administration of 50 microg kg(-1).
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