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.

中文翻译：

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刺桐提取物的植物化学，抗氧化和抗菌性能的研究

从天然来源发现用于新的传染性疾病的新的抗微生物化合物是非常令人感兴趣的。首次从刺艾（Eryngium billardieri）地上部分提取的乙醇提取物的总酚和类黄酮含量以及抗氧化剂和抗菌活性在当前工作中进行了评估。提取物的总酚含量为10.71至33.38 mg GAE / g干提取物，总黄酮的含量为15.04至27.13 mg QE / g干提取物。提取物的抗氧化活性使用1，1-二苯基-2-吡啶并肼基DPPH方法测定，发现其范围为17.25％至51.63％。提取物有效地阻止了革兰氏阳性菌和革兰氏阴性菌的生长。测定提取物的抗真菌活性，以菌丝体生长抑制的百分比计，范围为16.7‒61.7％。获得的结果表明，所有研究的性质都随着提取物浓度的增加而增加。提取物的抗氧化和抗菌活性与总酚和类黄酮呈正相关。