Table 3.
Minimum inhibitory concentration (MIC) of hemp EOs and common antibacterial drugs. Data are expressed as μg/mL.
| Bacterial strain | EO1 | EO2 | EO3 | EO4 | EO5 | EO6 | EO7 | EO8 | EO9 | EO10 | EO11 | EO13 | EO14 | EO15 | EO16 | EO17 | Ampicillin | Ciprofloxacin |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Staphylococcus aureus ATCC 6538 | 2 | - | - | - | - | - | - | - | 16 | 8 | 2 | - | - | - | - | - | - | 0.5 |
| Staphylococcus aureus 18As * | - | - | - | 16 | 32 | - | - | - | - | 16 | - | - | - | - | - | - | - | 16 |
| Staphylococcus epidermidis 18Bs * | 4 | - | - | 16 | - | 16 | - | - | 1 | 8 | - | 16 | - | - | - | - | - | 0.5 |
| Staphylococcus aureus 386 * | - | - | - | - | - | - | - | 32 | - | - | - | 16 | 16 | - | - | - | - | 16 |
| Listeria monocytogenes NCTC 10888 | 16 | 8 | - | - | 4 | 32 | - | - | 8 | 8 | - | 16 | - | 16 | - | - | 0.25 | - |
| Listeria monocytogenes ATCC 13932 | 4 | - | - | 32 | - | - | - | 32 | 8 | 16 | 4 | 16 | - | - | - | - | 0.25 | - |
| Listeria monocytogenes ATCC 5008 | 8 | - | 2 | - | - | - | 8 | 4 | - | 8 | 2 | 16 | - | - | 4 | 4 | 0.25 | - |
| Listeria monocytogenes 70 * | 4 | - | - | - | 32 | 32 | 2 | 16 | - | - | 4 | - | - | - | - | - | 2 | - |
| Listeria monocytogenes 139 * | - | - | - | - | 32 | - | 8 | 32 | - | - | 2 | - | - | 1 | - | - | 0.5 | - |
| Enterococcus faecalis ATCC 29212 | 2 | 2 | - | 16 | 0.5 | 4 | - | 1 | 8 | 2 | 2 | 16 | 1 | 1 | 4 | 4 | 4 | |
| Enterococcus hirae ATCC 10541 | 2 | - | - | 32 | - | 16 | 4 | - | 4 | 16 | 16 | 16 | 32 | - | - | - | - | 8 |
| Enterococcus faecalis V3 * | 1 | - | 2 | 32 | 32 | 4 | - | 4 | - | - | 4 | 16 | 32 | - | 4 | - | - | 0.25 |
| Enterococcus faecalis V4 * | 2 | - | - | - | - | 32 | 8 | 16 | 16 | 16 | 2 | - | - | - | - | - | - | 16 |
| Enterococcus faecium V5 * | - | - | 1 | - | 16 | 4 | 8 | 8 | 1 | 16 | 2 | 2 | 32 | 16 | - | - | - | 8 |
| Enterococcus faecalis V6 * | 2 | - | 0.5 | - | 16 | 16 | - | 8 | 1 | 16 | 16 | - | - | 8 | - | - | - | 16 |
| Enterococcus faecium EQ19 * | 2 | - | - | - | 8 | 4 | 4 | 8 | 8 | 16 | 16 | - | 2 | - | - | - | - | 4 |
| Bacillus subtilis ATCC 6633 | 2 | 8 | 2 | 8 | 8 | 16 | - | 16 | 4 | - | 8 | - | 1 | 2 | - | 4 | 2 | - |
| Bacillus cereus EB 362 | 1 | - | 1 | - | - | 1 | - | - | 1 | - | - | 16 | - | - | - | - | 2 | - |
| Bacillus 1 ˣ | 2 | 8 | - | - | 8 | 1 | - | - | 4 | 8 | 16 | 16 | - | 4 | - | - | 1 | - |
| Bacillus 2 ˣ | 0.5 | - | - | - | 16 | 16 | 8 | 16 | - | 16 | - | 16 | 32 | 16 | - | 4 | 0.25 | - |
| Bacillus 3 ˣ | - | - | 2 | 8 | - | 16 | 8 | 32 | - | - | 16 | - | 16 | 16 | 4 | - | 1 | - |
| Bacillus 4 ˣ | 2 | - | 2 | 32 | 16 | 1 | - | - | 4 | - | 16 | - | - | 4 | - | 4 | 0.25 | - |
| Bacillus 5 ˣ | 2 | - | 2 | - | - | 4 | - | 32 | 4 | - | - | 16 | - | 4 | - | - | 2 | - |
| Bacillus 6 ˣ | 2 | - | 1 | 16 | - | 4 | 8 | - | 4 | 16 | - | 16 | - | 8 | 4 | - | 1 | - |
| Bacillus 9 ˣ | - | - | 2 | 8 | 8 | 32 | - | - | 8 | - | - | - | - | 4 | - | - | 1 | - |
| Bacillus 10988 ˣ | 2 | - | - | - | - | 4 | 2 | 32 | 4 | - | 16 | 16 | - | 8 | - | 4 | 2 | - |
| Bacillus 18100 ˣ | 0.5 | - | - | - | - | 16 | - | - | 4 | - | - | - | - | - | - | - | 0.5 | - |
| Bacillus 18102 ˣ | 2 | - | 2 | - | - | 16 | - | - | 4 | - | 16 | 16 | - | 16 | - | - | 0.25 | - |
* Bacteria isolated from food samples. ˣ Bacteria isolated from food environments.