Table 2.
Quorum sensing inhibition activity (as pigment inhibition zone diameters) of phenolic compounds against Chromobacterium violaceum ATCC12472.
| Drug | Concentrations | Pigment Inhibition Diameter (mm) |
|---|---|---|
| (µg/disk) | Mean ± SD | |
| Tetracycline | 10 | 20.33 ± 1.53* |
| Furanone | 10 | 14.00 ± 1.00c |
| Normal Saline | — | — |
| Methyl gallate | 15 | 12.67 ± 1.15c |
| 30 | 16.67 ± 1.15b | |
| 60 | 23.33 ± 2.08a | |
| Phloroglucinol | 15 | 0.00 ± 0.00 |
| 30 | 0.00 ± 0.00 | |
| 60 | 0.00 ± 0.00 | |
| Pyrocatechol | 15 | 0.00 ± 0.00 |
| 30 | 0.00 ± 0.00 | |
| 60 | 9.33 ± 0.58d | |
| Pyrogallol | 15 | 10.33 ± 0.58* |
| 30 | 11.00 ± 1.00* | |
| 60 | 13.33 ± 0.58* | |
| Resorcinol | 15 | 0.00 ± 0.00 |
| 30 | 0.00 ± 0.00 | |
| 60 | 0.00 ± 0.00 |
Different superscript alphabets indicate significant difference (P > 0.05) in violacein pigment inhibition diameter. *Diameter of clear zone. Data shown represent the mean ± SD of three replicates.