Ultrasensitive and automated 1 pg/ml fluticasone propionate assay in human plasma using LC-MS/MS

Background: To develop and validate an ultrasensitive bioanalytical assay for quantitation of fluticasone propionate in human plasma, aliquots of 0.6 ml of K3EDTA human plasma were treated with zinc sulfate solution and loaded onto a preconditioned SPE plate. The sample solutions were washed, eluted, dried and reconstituted. The extracted sample was injected onto a LC–MS/MS system and separated by a reverse-phase HPLC column with a 5 min gradient program, and detected by MS/MS for fluticasone propionate quantitation. Results: Linearity was from 1 to 200 pg/ml. The intra- and inter-day accuracy and precision of the assay met validation acceptance criteria. Various...