Table 3.
The results of the antimicrobial analysis using Gram-positive and Gram-negative bacteria cultured with the investigated compounds at 37 °C for 18 h. The results are presented as the differences between the optical density measurements of the samples before and after culture (McFarland’s scale (CFU/mL).
| No. |
S. aureus
ATCC 25923 |
S. epidermidis
ATCC 12228 |
Escherichia coli
ATCC 25922 |
|||
|---|---|---|---|---|---|---|
| 200 μM | 250 μM | 200 μM | 250 μM | 200 μM | 250 μM | |
| BN | 5.1 | 5.6 | neg | 4.7 | neg | neg |
| 7a | 0.9 | 0 | neg | 0 | neg | neg |
| 7b | 2.2 | 0 | neg | 0 | neg | neg |
| 7c | 1.0 | 0.1 | neg | 0.7 | neg | neg |
| 7d | 0 | 0 | 0 | 0 | neg | neg |
| 7e | 0 | 0 | 0 | 0 | neg | neg |
| 7f | 0 | 0 | 0 | 0 | neg | neg |
| 9a | 0 | 0 | 0 | 0 | neg | neg |
| 9b | 0 | 0 | 0 | 0 | neg | neg |
| 9c | 0 | 0 | 0 | 0 | neg | neg |
| Control | 7.5 | 7.5 | 4.1 | 4.9 | 5.1 | 5.0 |
0: no difference between samples after 18 h of bacteria culture (bacteria grow was inhibited); neg: negative results (analog BN did not inhibit bacteria growing).