Table 3.
Classification of the ability of E. coli ATCC 25922 to adhere to and form a biofilm after an exposure to 1–5.
| Compound | Concentration (mg/L) | OD ± SD | Classification |
|---|---|---|---|
| None | 0 | 0.361 ± 0.159 | strong |
| 1 | 64 | 0.188 ± 0.012 | moderate |
| 2 | 64 | 0.195 ± 0.012 | moderate |
| 3 | 32 | 0.246 ± 0.038 | moderate |
| 4 | 64 | 0.172 ± 0.024 | weak |
| 5 | 64 | 0.194 ± 0.013 | moderate |
OD, optical density; SD, standard deviation; ODc, optical density cut-off value. Average OD value for negative control was found to be 0.065 ± 0.007, therefore ODc equals 0.065 + (3 × 0.007) = 0.086; 2 × ODc = 0.172; 4 × ODc = 0.344.