An ultra high performance liquid chromatography-electrospray ionization-tandem mass spectrometric method
(UHPLC/ESI-Q-TOF-MS) for the analysis of terbutaline (TB) in Wistar rat plasma has been developed and validated. The
chromatographic separation was achieved on a Waters ACQUITY UPLCTM BEH C18 (100.0 mmx2.1 mm; 1.7 μm) column
using isocratic mobile phase, consisting of 2 mM ammonium acetate and acetonitrile (90: 10; v/v), at a flow rate of
0.25 mL min-1. The transitions occurred at m/z 226.19→152.12 for TB, and m/z 260.34→183.11 for the internal standard.
The recovery of the analytes from Wistar rat plasma was optimized using liquid- liquid extraction technique (LLE) in
ethyl acetate. The total run time was 3.0 min and the elution of TB occurred at 1.85±0.05 min. The linear dynamic range
was established over the concentration range 1–1000 ng mL-1 (r2; 0.9938±0.0005) for TB. The intra-assay and inter-assay
accuracy in terms of % CV was in between 1.8–3.5. The lower limit of quantitation (LLOQ) for TB was 1.0 ng mL-1.
Analytes were stable under various conditions (in autosampler, during freeze–thaw, at room temperature, and under deepfreeze
conditions). The developed method was successfully applied for pharmacokinetic profiling in rodents.
Keywords: Asthma, Bronchodilator, Ex-vivo Stability, In-vitro assay, Matrix effect, Pharmacokinetics, Terbutaline;
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Published on: 14 May, 2012
Page: [189 - 195]