Determination of the oral platelet aggregation inhibitor @entity42392 in @entity35 , @entity235 , and XXXX plasma utilising HPLC-column switching combined with turbo ion spray single quadrupole mass spectrometry.

@entity1 @entity235 @entity1042 @entity9901 @entity35 @entity5189 @entity42392
A sensitive and selective HPLC-column switching method with single quadrupole mass spectrometric detection was developed for the simultaneous determination of the oral platelet aggregation inhibitor @entity42392 (double protected prodrug), its prodrug and the active metabolite in @entity35 , @entity235 , and @entity1 plasma. The three analytes together with their tri-deuterated internal standards were isolated from plasma by protein precipitation (0.5 M @entity9901 ). The de-proteinated samples were injected onto a standard-bore trapping column (4.0 mm i.d., LC-ABZ) of an HPLC-column switching system. Polar plasma components were removed by flushing the trapping column with @entity5189 (pH 3.6; 5 mM). Enriched compounds (including the analytes of interest) were backflushed onto a narrow-bore analytical column (2.1 mm i.d., Inertsil ODS-2) and separated by gradient elution ( @entity5189 / @entity1042 ). The whole effluent (200 microl/min) from the analytical column was passed to the turbo ion spray interface without splitting. Selected ion monitoring (SIM) was used for mass spectrometric detection. The limit of quantification for all three analytes was 1 ng/ml, using a 250-microl specimen of plasma. The mean precision and inaccuracy for the three analytes in all species were < 6 and < 5%, respectively. The practicability of the new analytical method was demonstrated by the analysis of about 500 @entity35 and @entity235 plasma and about 14,000 @entity1 plasma samples. The new method represents a successful example for the application of LC single MS with ionspray ionisation to the analysis of small molecule drugs in biological matrices from toxicokinetic studies and large clinical trials.
