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Viability by MTT assay of RAW 264.7 cells after 24 h of incubation with nanoparticle formulations prepared with three different concentrations: carvacrol (A), cinnamaldehyde (B), citral (C), and thymol (D). Differences were considered in comparison with the correspondent concentration of nonencapsulated compound. Values are the results of three independent assays. *, P < 0.05; **, P < 0.01; ****, P < 0.0001.
