Abstract: The environmental stresses such as high or cold temperatures, heat, UV irradiation and infection by pathogen stimulate the production of secondary metabolic products that have medicinal values and antioxidant properties such as phenolics and flavonoids. This study aimed to investigate the effect of seasonal variations of climatic conditions on phenolic and flavonoid compounds, as well as antioxidant capacity of three plant species belong to different families growing naturally in Wadi Halazein. The investigated plants were Seriphidium herba-alba, Teucrium polium and Peganum harmala. The results indicated that the total contents of phenolics and flavonoids was significantly affected by species and season and tended to increase during the climatic condition of summer season. The results.....
Keywords: Antioxidant activity, DPPH assay, FRAP, Serphedium herba alba
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