TY - JOUR T1 - Assessments of phenolic, flavonoid and antioxidant activity of aqueous, alcoholic, methanol and acetone extracts of thirteen medicinal plants TT - بررسی فعالیت آنتی اکسیدانی، فلاونوئیدی و فنلی عصاره های اتانولی، آبی، استونی و متانولی سیزده گیاه دارویی JF - nbr JO - nbr VL - 4 IS - 4 UR - http://nbr.khu.ac.ir/article-1-3040-en.html Y1 - 2018 SP - 299 EP - 309 KW - Artemisia absinthium KW - flooding extraction KW - free radicals KW - Zataria multiflora N2 - Phenolic compounds, especially those with plant origin, constitute an essential part of the human diet due to their antioxidant properties. Antioxidants protect biological systems (nucleic acids, proteins, lipids, lipoproteins) against free radicals and reactive oxygen species. Some medicinal plants contain so high amounts of antioxidants that their use can be considerably effective for human health. The aim of this study was to evaluate the effect of flooding extraction method on phenolic compounds, flavonoids and the level of free radical scavenging properties of medicinal plants including Thyme, Hamadani Yarrow, Shirazi mountain thyme, Yarrow, Chamomile, Saffron corm hyssop Sagebrush, wormwood, Artemisia and Ziziphora clinopodioiedes, in four extraction solvents including water, methanol, acetone and ethanol. The results showed that methanol and water solvents had the highest and the lowest total phenolic, flavonoid and antioxidant activity, respectively. The results also showed that methanol extraction of Shirazi thyme and water extraction of Wormwood plant had the highest and the lowest phenol and flavonoids contents, respectively. The results of trapping the free radicals of DPPH indicated that the methanol extract of Shirazi thyme and aqueous extract of wormwood had the highest and the lowest inhibition activities, respectively. Therefore, the selection of solvent type can affect the rate of the extraction of phenolic compounds, flavonoids and antioxidant activity. M3 10.29252/nbr.4.4.299 ER -