GA 2017

This study aimed to evaluate organic extracts in function of biomass production, organic extracts yields, phenolic, flavonoids, flavanols and antioxidant capacity levels and the allelopathic potential of Equisetum hyemale L. The extracts were made in ethanol, methanol and ethyl acetate by maceration. The determination of phenolic by Folin Ciocalteu, flavanols by vanillin acid, flavonoids by aluminum chloride, antioxidant activity by DPPH and reducing power by ferric chloride, allelopathy test front lettuce seed and biotoxicity (DL₅₀₎ by Artemia salina. The effectiveness of the vegetable extract under analysis is linked to the quality of the chemical properties of the extract. In all treatments color and odor of the extracts remained similar to that of the in natura species, after obtaining the dry residue. The highest yields of extracts, phenolic compounds and flavonoids were in methanolic extract (EH-MEOH), flavanols and reducing potential in the ethyl acetate extract (EH-ACOET), efficacy of obtaining the dry extract and antioxidant activity in ethanolic extract (EH-ETOH). In the bioassays, the lowest concentrations of all treatments did not lead to inhibition of growth and the lower toxicity can be attributed to the extract in ethyl acetate (EH-ACOET). Regarding the antioxidant properties can been directly related to bioflavonoids, and ethyl acetate and ethanol extracts were low toxicity.