Table 3.
Antimicrobial activity of R. officinalis EO from Serbia (SRB) and Russia (RF) (mean value diameter of the inhibition zone (mm) including disc (6 mm)) ± standard deviation).
| Group | Tested Strains | Disk Diffusion Method (15 µL of EO Concentration 100%) |
Positive Control | Negative Control | |||
|---|---|---|---|---|---|---|---|
| Tested Samples of EO | Antibiotic/Antimicotic | DMSO 5% |
|||||
| SRB | RF | CHL | TET | Actidion | |||
| G(-) bacteria |
E.coli ATCC 25922 |
32 ± 3 b | 40.0 ± 0.0 a | 29 ± 2 b | 21.0 ± 0.0 c | - | nd * |
|
P. aeruginosa ATCC 27853 |
10.0 ± 0.0 c | 21 ± 3 a | 12.3 ± 0.6 bc | 14.7 ± 0.6 b | - | nd | |
| G(+) bacteria |
B. cereus ATCC 11778 |
12 ± 1 d | 40.0 ± 0.0 a | 30.3 ± 0.6 b | 28 ± 1 c | - | nd |
|
S. aureus ATCC 25923 |
32 ± 2 b | 40.0 ± 0.0 a | 29.7 ± 0.6 b | 26.0 ± 0.0 c | - | nd | |
| Yeast |
S. cerevisiae ATCC 9763 |
33 ± 2 b | 40.0 ± 0.0 a | - | - | 40.0 ± 0.0 a | nd |
| Fungi |
A. brasiliensis ATCC 16404 |
11 ± 2 c | 33.0 ± 0.0 a | - | - | 26.3 ± 0.6 b | nd |
Values are presented as mean ± standard deviation (n = 3), different lowercase superscript within the same row indicate a significant difference of means according to Tukey’s honest significant difference (HSD) test (p < 0.05). CHL-chloramphenicol, TET-tetracycline, DMSO-dimethyl sulfoxide. * nd—not detected.