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. 2016 Feb 25;54(3):754–759. doi: 10.1128/JCM.02496-15

FIG 1.

FIG 1

FIG 1

(a) Ertapenem mass spectra generated by group A carbapenemases: ertapenem mass spectra (negative control in the experiment) (spectrum A); mass spectra of ertapenem plus a blaKPC-2 E. cloacae strain after 60 min of exposure (spectrum B); ertapenem plus blaKPC-2 E. cloacae plus DPA (spectrum C); and ertapenem plus blaKPC-2 E. cloacae plus PBA (spectrum D). The peaks indicated (↙) are representative of ertapenem and its hydrolyzed forms. (b) Ertapenem mass spectra generated by group B carbapenemases: ertapenem mass spectra (negative control in the experiment) (spectrum A); mass spectra of ertapenem plus a blaVIM-1 E. coli strain after 15 min of exposure (spectrum B); ertapenem plus blaVIM-1 E. coli plus DPA (spectrum C); and ertapenem plus blaVIM-1 E. coli plus PBA (spectrum D). The peaks indicated (↙) are representative of ertapenem and its hydrolyzed forms. (c) Ertapenem mass spectra generated by group D carbapenemases: ertapenem mass spectra (negative control in the experiment) (spectrum A); mass spectra of ertapenem plus a blaOXA-48 K. pneumoniae strain after 90 min of exposure (spectrum B); ertapenem plus blaOXA-48 K. pneumoniae plus DPA (spectrum C); and ertapenem plus blaOXA-48 K. pneumoniae plus PBA (spectrum D). The peaks indicated (↙) are representative of ertapenem and its hydrolyzed forms. Intens., intensity; a.u., arbitrary units.