Phytochemical and Biological Characterization of Methanolic Extracts from Rumex algeriensis and Rumex tunetanus

The present study is aimed at the evaluation of the phytochemical profile and the biochemical properties of methanolic extracts obtained from different parts of Rumex algeriensis and Rumex tunetanus, two relict species limited to the North Africa. Phytochemical analyses of these extracts were performed using standard colorimetric procedures, HPLC-DAD, and HPLC-DAD-ESI/MS, and their antioxidant/free radical scavenging capability was estimated through several in vitro cell-free assays. Moreover, the anti-inflammatory potential of these extracts was demonstrated in an in vitro model of acute intestinal inflammation using differentiated Caco-2 cells. The results showed that all the extracts appeared endowed with excellent antioxidant/free radical scavenging properties. In particular, the extracts from both R. algeriensis and R. tunetanus flowers, and that from R. algeriensis stems were characterized by a remarkable SOD-like and NO-scavenging activity, as well as by the capability to protect albumin against HClO-induced degradation. Furthermore, the extracts from flowers of both Rumex species, as well as R. algeriensis stems, showed an anti-inflammatory effect in intestinal epithelial cells, as demonstrated by the inhibition of TNF-α-induced gene expression of IL-6 and IL-8. In conclusion, R. algeriensis and R. tunetanus have shown to be potential sources of bioactive products to be used in the prevention and treatment of pathologies related to oxidative stress and inflammation.

Keywords: Caco-2; Rumex algeriensis; Rumex tunetanus; anti-inflammatory activity; antioxidant activity.