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Chinese Journal of Clinical Pharmacology and Therapeutics ›› 2011, Vol. 16 ›› Issue (11): 1272-1276.

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Determination of sidenafil concentration in human plasma by LC-MS/MS with internal standard method

DENG Xiao-lan1, TAN Zhi-rong1, CHEN Yao1, LI Hui1, WANG Yi-cheng1, HUANG Qi2, OUYANG Dong-sheng1   

  1. 1Institute of Clinical Pharmacology, Hunan Key Laboratory of Pharmacogenetics,Central South University , Changsha 410078 , Hunan, China;
    2School of Pharmaceutical Sciences, Central South University , Changsha 410078 , Hunan,China
  • Received:2011-08-31 Revised:2011-10-20 Online:2011-11-26 Published:2011-11-29

Abstract: AIM: To establish an LC-MS/MS method for determining the concentration of sildenafil in human plasma.METHODS: Diazepam was used as internal standard,the plasma samples extracted by MTBE were separated on a Waters XTerra MS C18 column (150 mm×2.1 mm, 5 μm) with mobile phase contained methanol and 10 mmol/L Ammonium acetate( 85∶15, V/V) at flow rate of 0.30 mL/min. The electrospray ionization (ESI source) in positive ion multiple reaction monitoring (MRM) were used for scanning analysis, then, sildenafil and diazepam ion selective channels were: m/z 475.3→58.1 and 285.5→154.0, respectively.RESULTS: The linear range for sildenafil was 1.50-765.90 ng/mL. The lower limit of quantitation was 1.50 ng/mL, and the relative standard deviation of intra-day and inter-day were less than 15%.CONCLUSION: The estalished method is suitable for clinical pharmacokinetic study of sildenafil.

Key words: LC-MS/MS, Sildenafil, Internal standard

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