All over the world, 80% of the population in developing countries still uses
traditional medicine to treat primary medical problems (4). Pharmacognocy, one of the
oldest scientific disciplines, has undergone major changes. Currently, plant based drugs
are researched, formulated, modified and efficiently used in modern drugs. In the past
decade, research has focused on the scientific evaluation of traditional drugs from plants
(14). Experimental evidence suggests that free radicals (FR) and reactive oxygen species
(ROS) can be involved in a large number of diseases (15). Plants produce antioxidants to
control oxidative stress caused by light and ROS. These products represent a new source
of compounds with antioxidant activity. Many studies (3, 15, and 16) have been
performed to identify pharmacologically active and antioxidant compounds that have
limited toxicity to normal cells (16).