AuNPs (10 nm) characterization by DLS, TEM and NAA. A. Summary of size and zeta potential results for AuNPs dispersed in water and media before and after 72 hours incubation at 37°C. B. TEM micrograph of 10 nm AuNP dispersed in water. C. Representative DLS histogram (intensity weighted) for 10 nm AuNPs before and after incubation at 37°C for 72 hours. D. DLS of AuNPs dispersed in media and media control before and after incubation at 37°C for 72 hours. E. TEM micrograph of 10 nm AuNPs dispersed in full cell culture media. F. Determination of AuNPs concentration by NAA as compared to TGA.