Table 1.
Principal volatile compounds for each strain after culturing in MOLP, SG and TSB media.
| Sample | Culture medium | Concentration of principal volatile compounds (μgL−1) | |||||
|---|---|---|---|---|---|---|---|
| Acetoin | Acetic acid | 2,3-butanediol | Isopentanol | Dimethyl disulphide | Isopentyl isobutanoate | ||
| Uninoculated media | MOLP | – | 3.8 (3.0) | – | – | – | – |
| SG | – | – | – | – | – | – | |
| TSA | – | – | – | – | – | – | |
| B. atrophaeus L193 | MOLP | 174.0 (10.4) | 36.9 (7.1) | 268.8 (23.0) | – | – | – |
| SG | 60.5 (15.6) | 10.0 (6.5) | – | – | – | – | |
| TSA | 44.5 (0.3) | 3.6 (1.1) | – | – | – | – | |
| B. velezensis XT1 | MOLP | 111.0 (8.5) | 21.9 (0.4) | 261.7 (49.3) | – | – | – |
| SG | 64.0 (9.6) | 6.1 (4.1) | – | – | – | – | |
| TSA | 60.0 (0.5) | 2.1 (0.0) | – | – | – | – | |
| Peribacillus sp. N3 | MOLP | – | 32.9 (4.5) | – | 7.7 (0.2) | – | – |
| SG | – | 30.8 (0.4) | – | – | – | – | |
| TSA | – | – | – | – | 5.6 (1.8) | – | |
| P. segetis P6 | MOLP | – | – | – | – | 3.6 (0.3) | – |
| SG | – | – | – | – | 46.1 (2.9) | – | |
| TSA | – | – | – | 3.1 (0.1) | – | – | |
| P. vulpis Z8 | MOLP | – | – | – | 6.1 (1.1) | 88.4 (2.7) | 82.5 (1.3) |
| SG | – | – | – | – | 139.7 (1.5) | 27.4 (1.9) | |
| TSA | – | – | – | – | 140.1 (4.3) | 52.0 (1.1) | |
| S. equorum subsp. equorum EN21 | MOLP | – | 180.2 (17.1) | – | 34.3 (2.1) | – | – |
| SG | – | 25.6 (1.9) | – | 73.4 (3.5) | – | – | |
| TSA | – | 4.1 (2.0) | – | 110.6 (27.7) | – | – | |
Concentrations of each volatile compound are expressed as the mean of two determinations, with standard deviation (SD) indicated in parenthesis – concentration not detected or insignificant.