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. 2012 Jul;50(7):2441–2443. doi: 10.1128/JCM.01002-12

Fig 1.

Fig 1

MALDI-TOF MS spectrum showing meropenem, sodium salts of meropenem, and degradation products. (A) Spectrum of meropenem solution. (B) Negative control (non-carbapenemase-producing isolate of Klebsiella pneumoniae). (C) NDM-1-producing Escherichia coli. (D) NDM-1-producing Acinetobacter baumannii. [Meropenemdecarbox+H]+, decarboxylated degradation product of meropenem after carbapenemase hydrolysis (m/z 358.5); [Meropenemdecarbox+Na]+, decarboxylated sodium salt of degradation product of meropenem after carbapenemase hydrolysis (m/z 380.5); [Meropenem+H]+, meropenem molecule (m/z 384.5); [Meropenem+Na]+, meropenem sodium salt (m/z 406.5); [Meropenem+2Na]+, meropenem disodium salt (m/z 428.5); [Meropenemhydr+2Na]+, disodium salt of degradation product of meropenem after carbapenemase hydrolysis (m/z 446.5).