Figure 4.

Radical scavenging activity of biosynthesized selenium nanoparticles (BioSeNPs) at different concentrations (0.5–5 μg ml⁻¹) against ABTS and DPPH radicals after 30 min. of incubation, as compared to tret-butyl hydroquinone (TBHQ 5 μg ml⁻¹). Data are presented as means ± SE. Bold uppercase letters indicate the significant differences between concentrations as compared to TBHQ, while lowercase letters indicate significant differences between DPPH and ABTS subjected to SeNPs and TBHQ.