ABSTRACT
The marine organisms are now an emphasis of natural products drug discovery research because of its relatively unexplored biodiversity compared to terrestrial environment. Research has been developed using many biotechnological tools to harness and to produce new marine essential compounds with the aim of increasing the availability and chemical diversity of marine organisms’ essential constituents. Indeed the bioprospecting marine organisms for secondary metabolite production are a promising area in marine biotechnology. Most of these marine organisms are great sources of natural antioxidants and nutritional compounds. This chapter examines the concepts of marine organisms, the antioxidants of the marine organisms (algae and sponges), and determination of antioxidant activities.
