Most of plants that used in traditional medicine have good antioxidant power. These include green tea, Berberis vulgaris, Scutellaria, Calotropis and etc.
The FRAP assay is often used to measure the antioxidant capacity of foods, beverages and nutritional supplements containing polyphenols.
The FRAP assay is robust, sensitive, simple, and speedy and facilitates experimental and clinical studies investigating the relationship among antioxidant status, dietary habits, and risk of disease.