Table 2. Synergistic Activity of Selected Compounds with Colistin (at a Fixed Concentration Equivalent to 0.5 × MIC) on Gram-Negative Bacteria of High Clinical Relevance.
| MIC,a μg/mL (potentiation fold, log2) |
||||
|---|---|---|---|---|
| compound | A. baumannii ATCC 17978 | E. coli CCUGT | K. pneumoniae ATCC 13833 | P. aeruginosa ATCC 27853 |
| 2-Quinolones | ||||
| 9 | 16 (5) | 32 (4) | 64 (3) | –b |
| 10 | 32 (4) | 32 (4) | 64 (3) | – |
| 11 | 64 (3) | 64 (3) | 16 (5) | – |
| Phenols | ||||
| 12 | 16 (5) | 8 (6) | 4 (7) | – |
| 13 | 8 (6) | – | – | – |
| 14 | 16 (5) | 4 (7) | 8 (6) | – |
| 15 | 4 (7) | 2 (8) | 4 (7) | – |
| 16 | 2 (8) | 8 (6) | 4 (7) | 2 (8) |
| 17 | 4 (7) | 8 (6) | 8 (6) | 4 (7) |
| 18 | 4 (7) | 4 (7) | 8 (6) | – |
| 19 | 4 (7) | 8 (6) | 8 (6) | – |
| Pyrazoles | ||||
| 20 | 32 (4) | 64 (3) | 64 (3) | – |
| 21 | 16 (5) | 64 (3) | 32 (4) | – |