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Determination of nifedipine concentration in human plasma by LC-MS and its application in pharmacokinetic study

Jing Zhang, Hao-Jing Song, Fan-Long Bu, Chun-Min Wei, Gui-Yan Yuan, Xiao-Yan Liu, Ben-Jie Wang, Rui-Chen Guo*   

  1. 1. Institute of Clinical Pharmacology, Qilu Hospital of Shandong University, Jinan 250012, China
    2. School of Pharmacy, Shandong University, Jinan 250012, China
  • Received:2010-05-23 Revised:2010-10-15 Online:2010-11-30 Published:2010-11-30
  • Contact: Rui-Chen Guo*

Abstract:

A sensitive and reproducible electro-spray ionization liquid chromatography-mass spectrometry (ESI-LC-MS) method was developed and validated to determine the concentration of nifedipine in human plasma. Following a simple liquid-liquid extraction with methylene chloride, nifedipine and nitrendipine (used as internal standard) were separated on a Diamonsil ODS column (150 mm×4.6 mm, 5 μm) by isocratic elution with acetonitrile-5 mmol/L ammonium acetate (52:48, v/v) at the flow rate of 1 mL/min, and detected by mass spectrometry in the selected ion monitoring (SIM) mode. The pseudomolecular ions [M+Na]+ (m/z 369.0 for nifedipine and 383.1 for nitrendipine) were selected as the target ions for quantification with fragment electric voltage of 110 V for nifedipine and 100 V for IS. Method validation demonstrated that the developed method had excellent specificity and sensitivity, and acceptable precision and accuracy. Good linearity was achieved over a wide range of (2-600) µg/L (r2>0.998). The plasma samples were stable after storing for more than 14 d and after two freeze-thaw cycles (-20 °C to 25 °C). The method was successfully applied to clinical pharmacokinetic studies of nifedipine.

Key words: Nifedipine, LC-MS, Pharmacokinetics

CLC Number: 

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