ANTIOXIDANT AND ANTI-INFLAMMATORY ACTIVITIES OF RUBUS FRUTICOSUS AND ZIZYPHUS VULGARIS METHANOL EXTRACTS
Keywords:Antioxidant, Anti-inflammatory, Phenolic compounds, Photolysis, Hemolysis, Inflammation
Objective: This report is an attempt to study the phenolic composition of Rubus fruticosus (RFE) and Zizyphus vulgaris (ZVE) methanol extracts and evaluate their antioxidant and anti-inflammatory effects in-vitro and in-vivo.
Methods: Total phenolic and total flavonoids contents of extracts were determined by spectrophotometric methods. Phenolic compounds were identified by HPLC-TOF/MS. The antioxidant activities were evaluated in vitro using DPPH, ABTS and FRAP assays. The effect of RFE and ZVE on DNA cleavage induced by H2O2 UV-photolysis was also investigated. The antioxidant effect of RFE and ZVE was tested in vivo using the blood total antioxidant capacity test in mice. On the other hand, the anti-inflammatory activity was assessed in vivo using two models of acute inflammation ear edema and vascular permeability.
Results: The phytochemical analysis of these extracts showed that RFE possesses higher polyphenolic and flavonoid content than ZVE. in the same way RFE exerted the highest antioxidant capacity with IC 50 value of 14 Âµg/ml in DPPH assay, 1.58 mmol of Trolox E/mg extract and 3.39 of mmol FesO4/mg extract in ABTS, and FRAP assay respectively. The studied extracts showed a concentration-dependent protective effect on DNA cleavage induced by H2O2 UV-photolysis. The daily oral administration of 200 mg/kg of RFE or ZVE during three weeks showed an improvement of the blood total antioxidant capacity; the HT50 values were151.45 min and 146.72 min for the groups treated with RFE and ZVE, respectively versus 122.5 min for the control group. The topical application of 2 mg/ear of RFE inhibited the croton oil-induced ear edema by 75.72%, while the inhibition exerted by ZVE was 64.24%. These inhibitions were higher than that of indomethacin, used as a reference. Moreover, the oral administration of 400 mg/kg of RFE inhibited significantly (33.57%) acetic acid induced vascular permeability in mice. However, this effect was lower than this of indomethacin. The inhibition effect exerted by ZVE was not significant.
Conclusion: The results obtained in this investigation showed that RFE possesses strong antioxidant and anti-inflammatory potential in comparison with ZVE, which may be attributed to the presence of polyphenolic phytoconstituents.
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