Table 2.
MICs, MBCs, and effects resulting by the combination between C. capitatus (CC), T. capitatus (TC) and T. serpyllum (TS) EOs with tetracycline (Tc) compounds against S. enterica strains after 48 h of incubation at 37°C.
| MICs | MBCs | FICI | Effects | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CCEO-Tc | TCEO-Tc | TSEO-Tc | CCEO-Tc | TCEO-Tc | TSEO-Tc | CCEO-Tc | TCEO-Tc | TSEO-Tc | CCEO-Tc | TCEO-Tc | TSEO-Tc | |
| 117 | 0.31/4 | 0.31/4 | 0.31/4 | 0.31/4 | 0.31/4 | 0.31/4 | 0.2 | 0.5 | 0.2 | S | S | S |
| 785 | 1.25/4 | 0.625/4 | 0.625/4 | 1.25/4 | 0.625/4 | 0.625/4 | 2 | 1 | 1 | C | I | I |
| 783 | 0.31/4 | 0.31/4 | 0.31/4 | 0.31/4 | 0.31/4 | 0.31/4 | 0.5 | 1 | 0.5 | S | I | S |
| 788 | 1.25/4 | 0.625/4 | 2.50/4 | 1.25/4 | 0.625/4 | 2.50/4 | 1 | 1 | 0.2 | I | I | S |
| 116 | 0.25/4 | 0.125/4 | 0.625/4 | 0.25/4 | 1.25/4 | 0.625/4 | 0.5 | 0.1 | 0.2 | S | S | S |
| 208 | 1.25/4 | 1.25/4 | 0.31/4 | 1.25/4 | 1.25/4 | 0.31/4 | 2 | 1 | 4 | C | I | A |
| 217 | 2.50/4 | 2.50/4 | 1.25/4 | 2.50/4 | 5.00/4 | 2.50/4 | 10 | 2 | 2 | A | C | C |
| 686 | 0.50/4 | 2.50/4 | 5.00/4 | 0.50/4 | 2.50/4 | 5.00/4 | 0.1 | 0.5 | 1 | S | S | I |
| 787 | 2.50/4 | 2.50/4 | 2.50/4 | 2.50/4 | 2.50/4 | 2.50/4 | 10 | 1 | 1 | A | I | I |
| 791 | 2.50/4 | 2.50/4 | 2.50/4 | 2.50/4 | 2.50/4 | 2.50/4 | 10 | 1 | 1 | A | I | I |
| 792 | 5.00/4 | 5.00/4 | 1.25/4 | 5.00/4 | 5.00/4 | 1.25/4 | 5 | 1 | 4 | A | I | A |
MICs and MBCs values are expressed as μL/mL for EOs and μg/mL for Tc. The standard deviation is not reported, being zero for all replicates. EO, Essential oil; CC, Coridothymus capitatus; TC, Thymus capitatus; TS, Thymus serpyllum, Tc, Tetracycline compounds; MICs, Minimum Inhibitory Concentrations; MBCs, Minimum Bactericidal Concentrations; FICI, Fractional Inhibitory Concentration Index. Effects: A, Antagonism; C, Commutative; I, Indifference; S, Synergism. A: FICI value > 2; C: 1 < FICI value ≤ 2; I: FICI value = 1; S: FICI value < 1.