Abstract
Objective: This study focuses on the antioxidant potential of Djibouti brown seaweed and their phenolic contents.
 Methods: We evaluated the antioxidant potential by DPPH method (1,1-diphenyl-2-picrylhydrazyl) and their phenolic contents of seven Djibouti seaweed: Cytoseira myrica, Padina pavonica, Sargassum fluitans, Sargassum ilifolium, Sargassum sp, Turbinaria triquetra and Turbinaria turbinata. Also, we searched the secondary metabolites of these seaweeds.
 Results: We obtain a higher antioxidant activity at 60,7±0,9 % and a higher phenolic content at 199,01±0,5 μg equivalent phloroglucinol (PGE)/g dry matter for Padina pavonica. A good linear correlation (R2 = 0,898) is observed between the antioxidant activity and the phenolic content of the seaweed studied. Also, two Padina pavonica collected in two different locations have different biochemical concentrations and antioxidant activity, suggesting the influence of the marine environment on the biosynthesis of secondary metabolites and the biological activities of seaweed.
 The present study shows the presence of tannins, saponosides, flavonoids and steroid-terpenes.
 Conclusion: The species studied show interesting antioxidant activities and can be consumed to prevent oxidative stress.
Highlights
Free radicals are molecules with an odd or unpaired electron in the outer orbital of their atomic structures, which makes them very reactive
The best yield and the lowest yield are obtained for the genus Turbinaria respectively for Turbinaria triquetra, collected at Khor Ambado, and for Turbinaria turbinate, collected at Moucha Island
The main types of secondary metabolites namely terpenes, alkaloids, flavonoids, tannins and saponins have been sought in the extracts
Summary
Free radicals are molecules with an odd or unpaired electron in the outer orbital of their atomic structures, which makes them very reactive These radicals are produced during cellular respiration and the human body owns a way to neutralize them. It happens that the production of these molecules becomes uncontrolled and settles what is called oxidative stress [1]. Macroscopic seaweed, classified according to their colors (green, red, brown and blue), have a richness in diversified antioxidant molecules. They have recognized the commercial value in various fields, such as food, cosmetics, textiles, paper mills, pharmaceuticals and medicine. The three African countries (Tanzania, Madagascar and South Africa) with an algal farming system represent only 0.093% of world production
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