Objective. To evaluate the antioxidant capacity and protective effect of aqueous and hydroalcoholic extracts of Senecio rhizomatus Rusby in rat erythrocytes subjected to oxidative stress with hydrogen peroxide (H 2 O 2 ). Methodology. This study used an experimental design. The extracts were obtained through maceration with 96° ethanol (SeR96), 70° ethanol (SeR70), 50° ethanol (SeR50) and through infused water (SeRAc). Secondary metabolites were identified through colorimetric reactions and precipitation. In each extract, we could determine the capacity to eliminate 2,2-diphenyl-1-picrylhydrazyl radical (DPPH), the reduction of ferric ion and the total polyphenol content. In addition, the activity on the plasma membrane redox system (PMRS) was evaluated in each extract. The protection against oxidative stress in erythrocytes was evaluated by determining the content of reduced glutathione (GSH) and malondialdehyde (MDA). Results. Alkaloids, flavonoids, phenolic compounds, sesquiterpene lactones and sugars were identified in all the extracts. The total polyphenols content showed a correlation with the reduction of ferric ion (r=0.885) and with DPPH radicals elimination (r = -0.899), where the one with the highest antioxidant capacity was SeR50. Thus, the SeR50 (all concentrations) and SeR70 (100 µg/mL concentration) significantly increased the PMRS activity compared to the control group. After inducing oxidative stress in erythrocytes, all the extracts maintained the GSH level and inhibited MDA formation significantly compared to the H 2 O 2 group. Conclusion. The antioxidant capacity of hydroalcoholic extracts (96°, 70°, 50°) and aqueous infusion of Senecio rhizomatus Rusby is related to the content of polyphenols. They increase the plasma membrane redox system activity in rat erythrocytes and protect them from oxidative stress induced with H 2 O 2, showing an increase in the concentration of reduced glutathione and a decrease in malondialdehyde.

Background. Encelia canescens Lam is a plant traditionally used in Peru for medicinal purposes, and is attributed antioxidant properties, indicating that it could be used in the prevention of non-communicable diseases. Objective: This study aims to evaluate the protection of erythrocytes from lipoperoxidation and the anti-inflammatory effect of ethanolic extract of E. canescens leaves in mice. Materials and methods: Protection from lipoperoxidation was evaluated by inhibition of hemolysis and quantifying malondialdehyde (MDA) concentration against oxidative stress induced with hydrogen peroxide (H 2 O 2) at 200, 150, 100, 50 and 25 μg/mL E. canescens concentrations. The 1% carrageenan-induced air pouch model was used for evaluated inflammation, where albumin, total proteins, MDA, number and leukocyte differentiation were determined in the exudate, and a histopathological evaluation was performed. The concentrations evaluated were 100, 250 and 500 mg/kg of E. canescens Results: All the concentrations evaluated protected protected erythrocytes from lipoperoxidation (p<0.05), being E.D. value 200 μg/mL. Regarding anti-inflammatory effect, the albumin, total proteins and MDA values of the treatment groups were lower than carrageenan 1% group (p<0.05), but, due to less leukocyte migration and presence of macrophages and the histopathological evaluation, the E.D value was 500 mg/kg. Conclusion: Ethanolic extracts of E. canescens leaves protect erythrocytes from lipoperoxidation and have dose-dependent anti-inflammatory effects maybe for presence of p-hydroxyacetophenone-derived, and these could be new safer anti-inflammatories.