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Background:  We previously developed a method for the simultaneous determination of the human immunodeficiency protease inhibitors: amprenavir, atazanavir, darunavir, indinavir, lopinavir, nelfinavir, ritonavir, saquinavir and tipranavir, the active nelfinavir metabolite M8 the non-nucleoside reverse transcriptase inhibitors efavirenz, nevirapine and etravirine and the internal standards dibenzepine,  13 C 6 -efavirenz, D5-saquinavir and D6-indinavir in plasma using liquid chromatography coupled with tandem mass spectrometry with a Sciex API3000 triple quadrupole mass spectrometer and an analytical run time of only 10 min. We report the transfer of this method from the API3000 to a supposedly less sensitive Sciex API365 mass spectrometer.

clinical chemistry and laboratory medicine

A less sensitive detector does not necessarily result in a less sensitive method: fast quantification of 13 antiretroviral analytes in plasma with liquid chromatography coupled with tandem mass spectrometry