Table 3.
Inhibitory concentration 50 (IC50) and selectivity index (SI) values determined for the selected essential oils.
| Essential oils | Vero cell line | SI | ||||
|---|---|---|---|---|---|---|
| IC50 (mg/mL) ± SD a | R2 b | E. coli O33 | E. coli O157:H7 | S. epidermidis | CV 026 | |
| Cymbopogon martini | 0,86 ± 0.12 | 0.97 | −0.54 | −0.54 | −0.54 | −0.24 |
| Lippia origanoides thymol-carvacrol (I) | 0.48 ± 0.02 | 0.99 | −0.19 | −0.19 | −0.19 | −0.19 |
| Lippia origanoides thymol-carvacrol (II) | 0.83 ± 0.02 | 0.98 | 0.35 | 0.04 | 0.04 | 0.35 |
| Thymus vulgaris | 1.76 ± 0.36 | 0.94 | 0.37 | 0.37 | 0.37 | 0.68 |
a The minimum dilution of essential oils which is capable of inducing cell death or inhibiting the proliferation of 50% of the cells. b Linear correlation coefficient.