Table 1.
VOCs detected in bacterial cultures and blank medium control is shown
| VOC | CAS# | m/z | Ec | Pa | Pa–Ec | Class |
|---|---|---|---|---|---|---|
| 2-Ethyl-trans-2-butenal | 63883-69-2 | 98 (M+) | ↓ | ↓ | ↓ | Aldehyde |
| Benzaldehyde | 100-52-7 | 77 (bp) | ↓ | ↓ | ↓ | |
| 2-Methylbutanal | 96-17-3 | 41 (bp) | ns | ↓ | ↓ | |
| Furfural | 98-01-1 | 96 (bp) (M+) | ns | ↓ | ↓ | |
| Hexanal | 66-25-1 | 44 (bp) | ↓ | ↓ | ↓ | |
| 2-Ethylhexenal | 645-62-5 | 126 (M+) | ↓ | ↓ | ↓ | |
| 2-Methylpropanal | 78-84-2 | 43 (bp) | ↓ | ↓ | ↓ | |
| 2,2-Dimethylpropanal | 630-19-3 | 86 (M+) | ↓ | ↓ | ns | |
| 1-Butanol | 71-36-3 | 56 (bp) | ↓ | ↓ | ns | Alcohol |
| 2-Butanol | 78-92-2 | 45 (bp) | ns | ↑ | ns | |
| 2-Furanmethanol | 98-00-0 | 98 (bp) | ↓ | ↓ | ↓ | |
| 2-Propanol | 67-63-0 | 43 (fg) | ns | ↑ | ns | |
| Ethanol | 64-17-5 | 31 (bp) | ↓ | ↓ | ↓ | |
| Pentane | 109-66-0 | 43 (bp) | ↓ | ↓ | ↓ | Alkane |
| Ethyl propionate | 105-37-3 | 102 (M+) | ↑ | ↓ | ↑ | Ester |
| 2-Methylfuran | 534-22-5 | 82 (bp) | ↑ | ns | ↑ | Heterocyclic |
| Acetone | 67-64-1 | 43 (bp) | ↑ | ↑ | ↑ | Ketone |
| 2-Heptanone | 110-43-0 | 58 (fg) | ↑ | ns | ns | |
| 2,6-Dimethyl pyrazine | 108-50-9 | 108 (bp) (M+) | ↑ | ns | ↑ | Nitrogen-containing compound |
| Dimethyl sulfide | 75-18-3 | 62 (bp) | ↑ | ns | ns | Sulfur-containing compound |
| Dimethyl disulfide | 624-92-0 | 94 (bp) | ↑ | ↑ | ↑ | |
| Methylthioacetate | 1534-08-3 | 90 (fg) | ↑ | ns | ↑ |
(M+) molecular ion, bp base peak, fg fragment
Unless depicted with ns (non-significant), (↑) and (↓) assigned to bacterial cultures indicate a statistically significant (after false discovery rate correction) increase and decrease respectively in headspace concentration in comparison to medium control. The normalised abundances of representative fragments (m/z) were used for hypothesis testing