“…The hemolytic activity of the PU elastomers was performed by using a screw-cap tube, which was made up of polystyrene. 39,40 The fresh 5 mL heparinized human blood was poured into the tube, and it was centrifuged for 5.0 minutes at 850 rpm. The obtained supernatant was decanted off, while the viscid pellets were washed with phosphate buffer saline (PBS) (pH ∼ 7.4).…”