Table 2.
Median values of the antibacterial activity of seven essential oils dissolved in ethanol at 70% (v/v) at two concentrations against six bacterial strains isolated from documents biofilms and indoor environments of archival repositories.
| Details of plant oils | Diameter of inhibition zone (mm) at 24 h∗a |
|||||||
|---|---|---|---|---|---|---|---|---|
|
Plant species |
Common name |
Conc. (%) |
Bacillus sp. | Bacillus polymyxa | Bacillus cereus | Bacillus thuringiensis | Enterobacter agglomerans | Streptomyces sp. |
| Pimpinella anisum | Anise | 50 | 0 | 2 | 0 | 5 | 4 | 5 |
| 25 | 0 | 5 | 0 | 7 | 6 | 7 | ||
| Syzygium aromaticum | Clove | 50 | 7 | 10 | 14 | 18 | 6 | 11 |
| 25 | 7 | 10 | 18 | 24 | 6 | 12 | ||
| Cuminum cyminum | Cumin | 50 | 4 | 5 | 0 | 0 | 5 | 8 |
| 25 | 4 | 4 | 0 | 0 | 5 | 4 | ||
| Allium sativum | Garlic | 50 | 15 | 14 | 8 | 8 | 30 | 30 |
| 25 | 10 | 11 | 8 | 7 | 30 | 30 | ||
| Laurus nobilis | Laurel | 50 | 10 | 4 | 0 | 0 | 2 | 4 |
| 25 | 7 | 4 | 0 | 0 | 2 | 2 | ||
| Citrus sinensis | Orange sweet | 50 | 7 | 6 | 8 | 8 | 1 | 12 |
| 25 | 10 | 5 | 7 | 8 | 1 | 12 | ||
| Origanum vulgare | Oregano | 50 | 12 | 11 | 25 | 21 | 11 | 14 |
| 25 | 10 | 10 | 30 | 30 | 8 | 11 | ||
| Controls | Ethanol | 70 | 0 | 0 | 0 | 0 | 0 | 0 |
| Gentamycin sulphate | 40 mg/mL | 17 | 20 | 18 | 21 | 26 | 32 | |
*Streptomyces sp. was incubated at 72 h.
aData are mean of three replications.