Man's dependence on plants for his existence dates back to the beginning of the human race. In the early days, he had only limited needs like food, shelter and clothing but with the advancement of civilization, his requirements also grew. The present day man depends heavily on a very large numbers of plants and animal produced to meet his daily needs. Traditional medicines are used by about 60%...

Natural products play an important role in drug discovery and many approved therapeutics as well as drug candidates have been derived from natural sources. They have been the source of most of the active ingredients of medicines. The beneficial medicinal effects of plant materials typically result from the combinations of secondary products present in the plan. These secondary metabolites const...