Simultaneous determination of rivaroxaban and sitagliptin in rat plasma by LC-MS/MS and its application to pharmacokinetic drug-drug interaction study

A sensitive and accurate LC-MS/MS method was developed and validated for the simultaneous quantification of rivaroxaban (RIV) and sitagliptin (SIT) in rat plasma using apixaban as internal standard (IS). An Agilent Eclipse plus C18 column (2.1 X 100 mm, 3.5 mu m, Agilent) was used for chromatographic separation with isocratic elution. Multiple reaction monitoring (MRM) using positive-ion ESI mode to monitor ion transitions of m/z 436.8 & RARR;144.9 for RIV, m/z 407.7 & RARR;173.8 for SIT, m/z 459.8 & RARR;442.8 for IS. The procedure of method validation included selectivity, linearity, precision, accuracy, matrix effect, extraction recovery and stability were conducted according to the guidelines of EMA and FDA. The results indicated that no obvious drug-drug interactions occurred might be owing to their differences in metabolic pathways.