Pharmacognostic evaluation of Suaeda divaricata Moq. (Chenopodiaceae), a medicinal species of Patagonia Argentina

NAMUNCURÁ MARÍA SOLEDAD; QUEZADA DIANA PAULA; CORDOBA OSVALDO LEON; FLORES MARIA LUJAN

Salamanca

Congreso; Salamanca Congress 2018; 2018

Universidad de Salamanca

Suaeda divaricata, 'vidriera', 'jume crespo', inhabits on the coast of thedistrict San Jorge Gulf. It is described for stomach pain, insect bites, dermatitis. We show antioxidant activity and chemical results obtained from the leaves collected in the spring of 2017, in Comodoro Rivadavia (reference in the Herbario Regional Patagónico, HRP 7457). Dried and ground leaves were extracted with water by infusion or with water by decoction. The extracts were recovered by centrifugation, concentrated under reduced pressure and lyophilized. Both were analyzed to determine chemical constituent groups, and by planar and instrumental chromatographic profiles (RP-HPLC-DAD). In addition, the antioxidant capacity was quantified using the DPPH method, determining the SC50.The extraction yields were important, 48 and 50% for infusion and decoction,respectively. In both extracts, flavonoids, carbohydrates and tannins were highlighted. TLC showed chlorogenic and isochlorogenic acids, kaempferol 3-O-rhamnoglucoside and 7-O-glycoside, rutin, vitexin 2?-O-rhamnoside and saponarin; the decoction also showed kaempferol 3-O-gentiobioside. The phenolic acids and the main flavonoids were corroborated by HPLC and UV spectra. The antioxidant capacity was very important, with a SC50 of 11 and 15 μg/ml for the infusion and decoction, respectively. Flavonoids, chlorogenic acid and carbohydrates present is related, at least in part, to the antioxidant activity also demonstrated. These metabolites give it the ability to survive in a habitat characterized by water scarcity, strong winds, intense UV radiation, salinity and soil contamination by hydrocarbons. The indicated constituents are extractable with water, allowing the design of a simple, relatively economical and environmentally suitable obtaining protocol.