antioxidant activity nonhuman 74 controlled study 64 antioxidant 62 unclassified drug 60 Article 51 Antioxidants 46 plant extract 44 chemistry 38 animal experiment 34 Animals 33 male 32 plant leaf 32 animal 29 human 29 rat 27 Plant Extracts 26 animal model 26 animal tissue 25 article 22 drug effect 22 oxidative stress 21 Antioxidant 20 Male 20 phenol derivative 20 DPPH radical scavenging assay 19 antiinflammatory activity 19 priority journal 19 superoxide dismutase 19 flavonoid 18