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Cell viability (%) of L929, MDA-MB-231, MCF-7 and 4T1 cells incubated for 24 h in complete medium (black columns) and with different types of AuNPs (Ratio 1, Ratio 2, Ratio 3 and Ratio 4 AuNPs) at a concentration of 128 ± 21 µM in terms of Au content. The results represent the mean value ± SD, n ≥ 5. Statistical significance represents: ** p < 0.01 compared with the cells from the same line incubated in complete medium, which represent 100% viability.
