Summary of inhibitor studies with particles
| M1 | M2 | M3 | DQ12 | TiO2 | |
| Haemolytic activity | + | + | + | ++++ | − |
| Hydroxyl radical involved in haemolysis | + | − | − | − | − |
| Superoxide anion involved in haemolysis | +++ | + | ++ | − | − |
| Hydroxyl radical involved in decreased epithelial cell metabolism | ++ | − | − | − | − |