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Matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectra of carbapenemase-non-producing isolates. (A) Mass spectrum of ertapenem disk after 3 h-incubation in 0.01 M PBS, pH 7.4 (negative control). (B–D) Mass spectra of ertapenem after incubation with carbapenemase-non-producing isolates of different species. Peaks corresponding to non-hydrolyzed form of ertapenem are indicated with arrows. Units on the Y axes represent relative intensity.
