A specific liquid chromatography-mass spectrometry/mass spectrometry spectrometric procedure for the quantitation of amprenavir drug in biological matrices was developed and validated. Chromatographic isolation was accomplished through a Zorbax C18 analytical stationary phase having the dimensions of 50 mm × 4.6 mm and particle size of 5.0 μm. Isocratic separation was processed with acetonitrile 0.1%v/v HCOOH in water and methyl alcohol in the proportion of 60:10:30 as a moveable system with a flow rate of 0.60 mL/min. Liquid-liquid extraction was carried out for drug and internal standard isolation with an ethyl acetate solvent. Parent and product ionic components were examined at m/z 506.2 → 89.1 for amprenavir and 367.1 → 350.1 for rilpivirine internal standard on the MRM (multiple reaction monitoring) mode. The linearity plot of analyte was rectilinear in the concentration over 0.15-1500 ng/mL with the correlation coefficient value of r 2 being >0.990. %relative standard deviation findings were <4.21% for intraday and interday accuracy and precision. The technique has good recoveries, and %recovery findings of LQC (low quality control), MQC(median quality control), and HQC (high quality control) solutions were 92.9%, 95.1%, and 96.4%, respectively. Amprenavir has more stability for longer time when subjected to different stability environments and the procedure was efficiently relevant to the regular investigation of amprenavir analyte in the biological matrix.
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