Table 2.
Antibacterial activity: diameter of the inhibition zone (in mm) against ATCC reference strains.
| Reference Strains | VNC | VNC 10 μg b | GNT | GNT 10 μg b |
|---|---|---|---|---|
| S. aureus ATCC 25923 | 14 ± 1 | 14 ± 1 | 18 ± 1 | 18 ± 1 |
| S. epidermidis ATCC 12228 | 15 ± 1 | 15 ± 1 | 23 ± 1 | 22 ± 1 |
| E. faecalis ATCC 29212 | 12 ± 1 | 12 ± 1 | 9 ± 1 | 8 ± 1 |
| E. coli ATCC 25922 | NA a | NA | 18 ± 1 | 19 ± 1 |
| K. pneumoniae ATCC 9591 | NA | NA | 18 ± 1 | 17 ± 1 |
| P. aeruginosa ATCC 27853 | NA | NA | 17 ± 1 | 18 ± 1 |
a NA, not appeared as expected because VNC is generally ineffective against Gram-negative bacteria; b Disks containing VNC or GNT used as positive controls. All experiments were performed on duplicate, on different days.