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. 2022 Mar 21;66(4):e02124-21. doi: 10.1128/aac.02124-21

TABLE 3.

Mass spectrometry analysis using IMI (atomic mass units)

β-Lactamase or antibiotic (1:1 ratio) Mass spectrometry result (AMU)
Apo +IMI 1 h +IMI 2 h +IMI 4 h +IMI 24 h
IMI 299 ± 3
KPC-2 28,319 ± 3 28,319 ± 3 28,319 ± 3 28,319 ± 3 28,319 ± 3
D179YKPC-2 28,366 ± 3 28,665 ± 3 28,665 ± 3 28,665 ± 3 28,366 ± 3 (66%), 28,665 ± 3 (34%)
KPC-3 28,344 ± 3 28,344 ± 3 28,344 ± 3 28,344 ± 3 28,344 ± 3
D179YKPC-3 28,393 ± 3 28,692 ± 3 28,692 ± 3 28,393 ± 3 (20%), 28,692 ± 3 (80%) 28,393 ± 3 (95%), 28,692 ± 3 (5%)