生物等效性和生物利用度杂志

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Determination of Aprepitant in Human Plasma by Using LC-MS/MS with Electrospray Ionization

Ravi Prakash PVDLS, Sumadhuri B and Srikanth M

A precise, sensitive and high throughput liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for determination of Aprepitant (APT) in human plasma was developed and validated using Quetiapine (QTP) as internal standard. The analyte and internal standard were extracted from human plasma using liquid-liquid extraction. Chromatographic separation was performed on Discovery C18 10 cm×4.6 mm, 5 μm column with an isocratic mobile phase composed of 5 mM Ammonium Acetate (pH 4.00):Acetonitrile (10:90), at a flow-rate of 0.9 ml/ min. The MS-MS detection was performed on a AB Sciex API 3200 tandem mass spectrometer operated in Multiple reaction monitoring (MRM) at positive mode at m/z 535.10/277.10 and 384.00/253.10 for APT and QTP respectively. A linear dynamic range of 10.004-5001.952 ng/ml for APT was evaluated with mean correlation coefficient (r) of 0.9991. The precision of the assay (expressed as coefficient of variation, CV) was less than 15% at concentrations of LQC, MQC, HQC and was less than 20% for LLOQQC. Percent recoveries for APT at high, middle and low quality control samples was found to be 71.9%, 68.0%, and 63.8% respectively and for internal standard 77.7%. The analyte was found to be stable throughout five freeze-thawing cycles, bench top, wet extract, dry extract, auto sampler and interim stability studies. Therefore, the proposed method was found to be suitable for the routine quality control analysis of Aprepitant in human plasma in bioequivalence studies.