Time points Silver nanospheres Gold nanospheres Viability % Viability% 0 78 99.2 20 min 43.2 96.2 30 min 39.7 96.7 1 h 24.9 93.7 24 h 14.2 92.2 48 h 9.3 86.8

Table 2: Time exposure/ viability of raw macrophage exposed to fixed concentration (20 μg/ml) of silver or gold nanospheres for different time points.