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Anti-oxidant enzyme activity in the NPs treated cells. a–d SOD activity in the HaCaT cells at 24, 48, 72, and 96 h, respectively exposed to different concentrations of NPs. e–h CAT activity in the HaCaT cells at 24, 48, 72, and 96 h, respectively exposed to different concentrations of NPs. The values are represented as means ± SD of two independent experiments. *p < 0.05, **p < 0.01, ***p < 0.001 significantly different in the enzyme activity of NPs concentration vs control
