Figure 1From: Label-free in vitro toxicity and uptake assessment of citrate stabilised gold nanoparticles in three cell lines Absorbance spectrum of the gold nanoparticles. The UV–vis spectrum of 14 nm and 20 nm AuNPs at 1 nM in A) milli-Q water, B) in RPMI culture medium, and C) in Ham’s F12 culture medium.Back to article page