Antioxidant Properties of Nine Commonly Used Medicinal Plants in Arabs Region

Abstract

The present study was conducted to investigate the total phenolics, total flavonoid, and Trolox equivalent antioxidant capacity of 9 commonly used medicinal plants and herbs among Arabs nation namely, Trachyspermum ammi (Apiaceae) seeds, Ferula assa-foetida (Apiaceae) dried latex, Elettaria cardamomum (Zingiberaceae) fruit 1, Senna alexandrina (Caesalpinioideae) Leguminosae leaves, Adenium obesum (Apocynaceae) leaves, Elettaria cardamomum (Zingiberaceae) fruit 2, Trigonella foenum-graecum (Leguminosae) seeds, Lepidium sativum (Brassicaceae) seeds, Ziziphus spina-christi (Rhamnaceae) fruit, and Nigella sativa (Ranunculaceae) seeds.The methanol extract of each plant was obtained by dissolving 2g of plant powder in 20 ml methanol-water (4:1v/v) to overnight at room temperature. The supernatants were concentrated by using a rotary evaporator. Residues of each extract were dissolved in distilled water and the final volume was recorded. A serial dilution of 10, 100, 1000, and 5000 were made.