An investigation on phytochemical, antioxidant and antibacterial properties of extract from Eryngium billardieri F. Delaroche

It is of great interest to find new antimicrobial compounds from natural origins for new contagious diseases. For the first time, total phenolic and flavonoid contents as well as antioxidant and antimicrobial activities of ethanolic extract from aerial parts of Eryngium billardieri were evaluated in the present work. Total phenolics of the extracts ranged from 10.71 to 33.38 mg GAE/g dry extract, and the total flavonoids varied from 15.04 to 27.13 mg QE/g dry extract. Antioxidant activity of the extract was determined using the 1,1-diphenyl-2-picrylhydrazyl DPPH procedure, and found ranged between 17.25 and 51.63%. The extract prevented effectively the growth of both Gram-positive and Gram-negative bacteria. Antifungal activity of extract was measured as percentage of mycelium growth inhibition and found to be in the range of 16.7‒61.7%. The obtained results indicated that all the studied properties increased with increasing concentration of the extract. Antioxidant and antimicrobial activities of the extract were positively associated with the total phenolics and flavonoids.