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The antioxidant, antimicrobial activity, total phenolic content and flavonoid concentration of Seseli rigidum Waldst. et Kit. were evaluated. Five different extracts of the aboveground plant parts were obtained by extraction with distilled water, methanol, acetone, ethyl acetate and petroleum ether. Total phenols were determined using the Folin-Ciocalteu's reagent, with the highest values obtained in the acetone extract (102.13 mg GAE/g). The concentration of flavonoids, determined by using a spectrophotometric method with aluminum chloride and expressed in terms of rutin equivalent, was also highest in the acetone extracts (291.58 mg RUE/g). The antioxidant activity was determined in vitro using DPPH reagent. The greatest antioxidant activity was expressed in the aqueous extract (46.15 μg/ml). In vitro antimicrobial activities were determined using a microdilution analysis method; minimum inhibitory concentration (MIC) and minimum microbicidal concentration (MMC) were determined. Methanolic extract had the greatest influence on bacilli (MIC at 0.0391 mg/ml), but the best antimicrobial effect had acetone and ethyl acetate extracts considering their broad impact on bacteria. According to our research, S. rigidum can be regarded as promising candidate for natural plant source with high value of biological compounds.

In vitrobiological activity of secondary metabolites fromSeseli rigidumWaldst. et Kit. (Apiaceae)