Table 4.
Minimal inhibitory and bactericidal concentrations of different compounds
| Bacterial strains | Compounds and concentrations (μg/mL) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 6 | Chloramphenicol | |||||||||
| MIC | MBC | R | MIC | MBC | R | MIC | MBC | R | MIC | MBC | R | |
| Escherichia coli | ||||||||||||
| ATCC8739 | 128 | 512 | 4 | 256 | – | > 1 | 256 | – | > 2 | 2 | 64 | 32 |
| AG102 | 256 | – | > 1 | – | nt | nd | – | nt | nd | 32 | 256 | 8 |
| Klebsiella pneumoniae | ||||||||||||
| ATCC11296 | 128 | nt | nd | 256 | 512 | 2 | – | nt | nd | 32 | 256 | 8 |
| KP55 | – | – | > 1 | 512 | – | > 1 | – | nt | nd | 64 | 256 | 4 |
| Enterobacter aerogenes | ||||||||||||
| ATCC13048 | 128 | – | > 1 | – | nt | nd | – | nt | nd | 16 | 128 | 8 |
| EA27 | 128 | 512 | 4 | – | nt | nd | – | nt | nd | 32 | 256 | 8 |
| Providencia stuartii | ||||||||||||
| ATCC29916 | 128 | – | > 1 | 256 | – | > 2 | – | nt | nd | 64 | 256 | 4 |
| PS2636 | – | nt | nd | – | nt | nd | – | nt | nd | 64 | 256 | 4 |
| Pseudomonas aeruginosa | ||||||||||||
| PA01 | 512 | – | > 1 | 512 | – | > 1 | 512 | nt | nd | 64 | – | > 4 |
| PA124 | – | nt | nd | 512 | – | > 1 | – | nt | nd | 64 | – | > 4 |
| PSBS (%) | 70 | 60 | 20 | 100 | ||||||||
MIC minimal inhibitory concentration, MBC minimal bactericidal concentration R: MBC / MIC ratio (a sample is considered as bacteriostatic or bactericidal when this ratio is > 4 or ≤ 4 respectively) (−): MIC or MBC > 512 μg/mL nt: not tested nd: not determined (as no MIC and MBC values were not observed till 512 μg/mL) PBSS: percentage of susceptible bacteria to substances Compounds 1, 2 and 6 were obtained from fraction CSBc Compounds 3 isolated from the residual extract and compounds 4 and 5 isolated from fraction CSBb did not showed any activity against all studied bacterial