Table 1. Replication index (RI) of listeria strains in CaCo-2 cells in presence of TiO2 NPs.
| Strains + Ti02 NPs (µg/ml) | Replication Index |
| LM2+0 | 1.55±0.1 |
| LM2+0.08 | 1.45±0.3 |
| LM2+0.8 | 1.22±0.4 |
| LM2+8 | 0.8±0.3 |
| LM2+80 | 0.75±0.4* |
| LM9+0 | 11.12±0.2 |
| LM9+0.08 | 11.4±0.3 |
| LM9+0.8 | 11.2±0.5 |
| LM9+8 | 10.57±0.3 |
| LM9+80 | 5.41±0.1*** |
Replication index: Intracellular growth was expressed as replication index (RI) which corresponds to the number of CFU 3 hrs post-infection divided by the number of CFU 1 hr post-infection. Data are presented as means (± standard deviation) of at least three experiments. Asterisks indicate statistically significant values compared to control bacterial cells (*p<0.05; ***p<0.001).