Table 2.
Inhibitory zone diameters and minimum inhibitory concentration of Syzygium aromaticum essential oil and eugenol on different bacterial cultures after 24 hours of treatment.
| Antimicrobial assay | Compounds | Bacteria strain | ||
|---|---|---|---|---|
| E. coli | S. aureus | P. aeruginosa | ||
| Inhibition zones (mm) | S. aromaticum | 22.67 ± 0.577a | 25.00 ± 1.000a | 14.00 ± 1.000a |
| Eugenol | 20.33 ± 0.577a | 22.33 ± 0.577b | 11.00 ± 1.000b | |
| Gentamycin | 13.33 ± 1.155b | 20.33 ± 0.577b | 16.67 ± 0.577c | |
| Ampicillin | 13.67 ± 0.577b | — | 8.33 ± 1.155d | |
|
| ||||
| MIC (μg/mL) | S. aromaticum | 100.0 ± 0.00a | 50.0 ± 0.00a | 200.0 ± 0.00a |
| Eugenol | 100.0 ± 0.00a | 250.0 ± 0.00b | 200.0 ± 0.00a | |
| Gentamycin | 16.00 ± 0.00b | 8.00 ± 0.00c | – | |
| Polymyxin B | — | — | 16.00 ± 0.00b | |
MIC: minimum inhibitory concentration. Data represent mean ± standard deviation of experiment carried out in triplicate. Different letters in the same column in each antimicrobial assay mean statistical difference between groups.