Figure 1.

Antioxidant activity determined by ABTS, DPPH, FRAP, and ORAC assays of extracts from Lavandula viridis L’Hér and Thymus lotocephalus G. López and R. Morales shoots cultured in media with 0 (control), 1, 5 or 10 mg/mL of CuO, ZnO and Fe₃O₄ nanoparticles. Values are expressed as mean ± SE (n = 3). In each graph bars followed by different letters (a–f) are significantly different at p < 0.05 (Duncan’s New Multiple Range Test). ABTS: 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid); DPPH: 2,2-diphenyl-1-picrylhydrazyl; FRAP: ferric reducing antioxidant power; ORAC: oxygen radical absorbance capacity.