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Table 2 Median concentrations of VOCs released or consumed by Staphylococcus aureus

From: Molecular analysis of volatile metabolites released specifically by staphylococcus aureus and pseudomonas aeruginosa

  median concentrations [ppbv]
Compound CAS m/z for SIM medium 1.5 h 3.0 h 4.5 h 6.0 h
propanal 123-38-6 57 3.955 10.62 14.22 8.932 7.04
3-methyl-2-butenal 107-86-8 55, 84 1.526 1.832 3.415 5.708 5.348
2-ethylacrolein 922-63-4 84 1.656 2.01 6.453 5.537 5.775
(Z)-2-methyl-2-butenal 1115-11-3 84 73.48 81.91 177.4 268.5 247.9
(E)-2-methyl-2-butenal 497-03-0 84 < LOD < LOD 0.259 0.394 0.381
benzaldehyde § 100-52-7 107 20.64 19.08 17.65 12.66 3.815
methacrolein 78-85-3 70 5.922 5.644 9.328 7.617 6.36
acetaldehyde 75-07-0 43 528.5 606.4 374.2 1022.7 1417.4
3-methylbutanal ** 590-86-3 - 317.1 403.3 2764.3 4779.3 4818.5
2-methylpropanal ** 78-84-2 598.6 658.5 2044.5 1698.6 1299.5
1-butanol 71-36-3 56 < LOD < LOD < LOD 21.24 59.4
2-methyl-1-propanol 78-83-1 56, 74 0 0 0 21.32 52.62
3-methyl-1-butanol 123-51-3 55, 70 0 0 0 27.65 210.0
ethanol ** 64-17-5 - 0 89.57 237.0 6173.0 11695.1
acetoin (hydroxybutanone) 513-86-0 88 < LOD 3.59 8.004 140.6 279.3
acetol (hydroxyacetone) 116-09-6 74 < LOD < LOD < LOD 113.5 331.0
2,3-butanedione 431-03-8 86 22.65 23.92 27.45 49.84 67.99
acetic acid 64-19-7 45, 60 0 0 0 880.5 2566.6
isovaleric acid 503-74-2 60 0 0 0 31.13 97.35
ethyl acetate 141-78-6 61 0 0 0 1.973 5.624
n-butyl acetate 123-86-4 56, 73 0 0 0 0 0.239
ethyl isovalerate 108-64-5 70 0 0 0 < LOD 0.852
isopentyl acetate 123-92-2 55, 70 0 0 0 < LOD 1.938
ethyl formate 109-94-4 31 0 0 0 < LOD 3.188
methyl methacrylate ** 80-62-6 - 15.99 14.79 20.27 28.65 31.93
methanethiol 74-93-1 47 134.2 210.4 360.6 559.4 701.5
dimethyldisulfide (DMDS) 624-92-0 94 1.558 2.221 3.657 8.134 10.24
1,3-butadiene 106-99-0 54 < LOD < LOD 4.941 4.342 4.313
2-methylpropene 115-11-7 56 < LOD < LOD 4.546 14.31 21.89
n-butane 106-97-8 58 0.664 0.703 1.274 2.504 4.329
(Z)-2-butene 590-18-1 56 0 0 < LOD 3.687 4.789
(E)-2-butene 624-64-6 56 1.344 < LOD 4.793 11.32 13.73
propane 74-98-6 43, 41 0.91 0.815 1.951 3.441 4.902
  1. Bold numbers indicate significant difference (Kruskal-Wallis test) in VOC concentrations between bacteria cultures and medium headspace (p < 0.05). Ethanol, 2-methylpropanal, 3- methylbutanal and methyl methacrylate were analyzed in TIC mode as indicated by **, while the remaining compounds were analyzed in SIM mode. Number of independent experiments n = 5 for each time point of bacteria growth, n = 14 for all medium controls. Concentrations are given in ppbv, § uptake (decreased concentration).