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MTS assays on HDF cells in the presence of Ag/Au-NPs at atomic ratios (Ag:Au) of (A) 20:80, (B) 40:60, (C) 60:40 and (D) 80:20 at concentrations ranging from 5 to 20 µg/mL. Data = mean ± SD, N = 3. * p < 0.05 versus control (0 µg/mL concentration) and ** p < 0.01 versus control (0 µg/mL concentration). The statistical analysis was based on a t-distribution.
