Figure 5 The changes in the content of 3-hydroxy-2-butanone (acetoin) emitted by standard strain at the T2 time point before and after the addition of carbapenemase inhibitors. (A) The pseudo-3D plots of 3-hydroxy-2-butanone (acetoin) contents in standard strains before and after the addition of carbapenase inhibitors. VOCal (version 0.1.3), G.A.S., Shandong HaiNeng Scientific Instrument Co., Ltd., Shandong, China. (B) Comparison of the relative peak volume (semiquantitative) of 3-hydroxy-2-butanone (acetoin) emitted by standard strains before and after the addition of carbapenase inhibitors. The free online tool Chiplot (https://www.chiplot.online). The Mann-Whitney U test was used for pairwise comparison. * P<0.05. R version 4.2.3, The R Foundation, Vienna, Austria. ATCC – American Type Culture Collection; IPM – imipenem; DPA – pyridine-2,6-dicarboxylic acid.