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Antioxidant capacity of silica nanoparticles (PEG-SiNPs), free genistein (Gen) and genistein-PEGylated silica hybrid nanomaterials (Gen-PEG-SiHNM) determined by (A) the oxygen radical absorbance capacity (ORAC) and (B) the Trolox equivalent antioxidant capacity (TEAC) assays. Results are expressed as mean ± SEM of three individual experiments by triplicate. Different letters indicate statistical differences (P < 0.05) among samples analyzed by one way ANOVA followed by Tukey test.
