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Representative MRM chromatograms. The peaks are shown in an overall overview of positive and negative ionization, including retention times in a sample MRM chromatogram for 10 mg/L of antimicrobials in lithium–heparin plasma. A, MRM chromatogram of all antimicrobials (quantifier) with positive ionization, (B) MRM chromatogram of all antimicrobials (quantifier) with negative ionization.
