Table 3.
Minimum inhibitory concentrations (MICs) for the selected essential oils and extracts against some Gram-negative bacteria
| MIC50 and MIC90 of plant extracts (µl/ml) | ||||||||
|---|---|---|---|---|---|---|---|---|
| E. coli O157:H7 | Y. enterocolitica O9 | Proteus spp | K. pneumoniae | |||||
| MIC50 | MIC90 | MIC50 | MIC90 | MIC50 | MIC90 | MIC50 | MIC90 | |
| Origanum syriacum. | 12.5 | NA | 1.5 | 12.5 | 1.5 | 12.5 | 6.25 | NA |
| Thymus syriacus. Boiss. | 12.5 | NA | 6.25 | 25 | 3.125 | 25 | 3.125 | NA |
| Syzygium aromaticum | 25 | 50 | 6.25 | 25 | 1.5 | 50 | 1.5 | 25 |
| Cinnamomum zeylanicum | 12.5 | 25 | 6.25 | 25 | 1.5 | 25 | 3.125 | NA |
| Laurus nobilis L. | 12.5 | NA | 6.25 | 50 | 3.125 | 50 | 6.25 | 12.5 |
| Juniperus foetidissima Wild | 25 | 50 | 25 | 50 | 12.5 | 50 | 12.5 | 25 |
| Allium sativum L. | 12.5 | 25 | 6.25 | 50 | 3.125 | 50 | 6.25 | 50 |
| Myristica fragrans Houtt | 6.25 | 50 | 12.5 | 50 | 12.5 | NA | 6.25 | NA |