Additional file 2 of Titanium dioxide and carbon black nanoparticles disrupt neuronal homeostasis via excessive activation of cellular prion protein signaling

Additional file 2: Fig. S1. Hydrodynamic diameter (nm) of TiO2- and CB-NPs measured by DLS in DMEM/F12 at 37 °C. Diameter (nm) of aggregates of TiO2 and CB nanoparticles was measured by DLS following sonication of NPs, dilution in DMEM/F12, and centrifugation for 2 sec at 2000 g to remove large aggregates. At 10, 25 and 50 µg ml−1, TiO2-NPs displayed an average diameter of 130 nm (Polydispersity Index-PDI = 0.21), 206 nm (PDI = 0.53), and 375 nm (PDI = 0.22), respectively, and CB-NPs 171 nm (PDI = 0.13), 188 nm (PDI = 0.15), and 327 nm (PDI = 0.52), respectively. The experiments were performed in triplicates.