Table 8.
Antibacterial activity (inhibition zone, mm) of Artemisia annua and Artemisia dracunculus essential oils (EOs) against Escherichia coli, Bacillus subtilis, Streptococcus aureus and Candida albicans microbial strains. Data are presented as the mean ± standard error
| EO | Dose (aμl.disc-1) | E. coli | B. subtilis | S. aureus | C. albicans |
|---|---|---|---|---|---|
| A. annua | 10 | 20.8 ± 0.5 bBC | 18.0 ± 0.9 bAB | 7.3 ± 0.5 bA | 29.3 ± 0.6 bB |
| 5 | 13.0 ± 0.5 bBC | 14.3 ± 0.2 bAB | 0.8 ± 0.3 bA | 21.7 ± 0.6 bC | |
| 2.5 | 8.7 ± 0.6 abB | 8.0 ± 0.4 abB | 0.0 ± 0.0 aA | 17.5 ± 0.7 abB | |
| 1.25 | 1.7 ± 0.2 aB | 1.3 ± 0.2 aB | 0.0 ± 0.0 aA | 11.0 ± 0.5 aB | |
| 0.63 | 0.0 ± 0.0 aA | 0.0 ± 0.0 aA | 0.0 ± 0.0 aA | 5.3 ± 0.6 aB | |
| A. dracunculus | 10 | 15.2 ± 0.2 bA | 32.0 ± 1.0b AB | 14.3 ± 0.2 bA | 35.2 ± 0.6 bB |
| 5 | 12.2 ± 0.4 abA | 21.2 ± 0.6 abAB | 11.5 ± 0.2 abA | 31.2 ± 0.8 bB | |
| 2.5 | 9.5 ± 0.6 abA | 16.0 ± 0.4 abAB | 7.3 ± 0.3 abA | 28.5 ± 0.3 abB | |
| 1.25 | 8.3 ± 0.3 aAB | 9.0 ± 0.5 aAB | 5.7 ± 0.2 aA | 13.3 ± 0.6 abB | |
| 0.63 | 7.8 ± 0.3 aAB | 8.3 ± 0.4 aB | 5.3 ± 0.3 aAB | 3.5 ± 0.3 aA |
Note: different lower case letters indicate significant differences among different doses of each EO; different capital letters indicate significant differences among microbial strains at the same doses of each EO (Kruskal-Wallis, Dunn-Bonferroni pairwise comparisons, P ≤ 0.05)