Figure 6

Distribution of spectral peak wavelengths measured from different cells of same population. Cells were exposed to (A) 12, (B) 24, (C) 48, and (D) 96 μg/mL of AuNPs for 2, 5, 10, or 24 h. Cell ROI spectral peak wavelengths among different cells increase in diversity with time. To note, at 2 h, only cells exposed to the 96 μg/mL dose of AuNPs (D) exhibited optical spectra for which a peak wavelength could be determined. At all lower exposure doses (A, B, C) at 2 h, the measured spectra was dominated by cell scattering.