Fig. 3From: Simultaneous determination of colistin sulfate and tigecycline in human plasma by liquid chromatography-tandem mass spectrometry methodMS spectra of polymyxin E1, polymyxin E2, tigacycline and polymyxin B1. (A) precursor ion of Polymyxin E1 and polymyxin E2; (B) precursor ion of tigecycline; (C) precursor ion of polymyxin B1; (D) product ion of polymyxin E1; (E) product ion of Polymyxin E2; (F) product ion of tigecycline; (G) product ion of Polymyxin B1Back to article page