Figure 4: Time- and frequency-dependent capacitance values in PEG-NPs treated cells.
From: Real-time and label-free monitoring of nanoparticle cellular uptake using capacitance-based assays
Time-dependent normalized capacitance values, C/Co, where Co is the initial capacitance for HUVECs treated with TNF-α at 24 hours (violet arrow); PEG-NPs#1 and NH3+-PNPs (a); and PEG-NPs#2 and COO−-PNPs (d) treated at 48 hours (gray arrow). After the initial measurement at 100 Hz, the capacitance was measured at various frequencies from 100 Hz to 20 kHz. Time-dependent estimates of α (b,e) and β (c,f) from real-time capacitance measurements using our capacitance sensor array (n = 5).
