Antioxidant Potential of Ethanolic Extract of Sargassum polycystum C.A. Agardh. Naturally Growing in Lange Seashore

This work aims to evaluate the antioxidant properties of an ethanolic extract of Sargassum polycystum C.A. Agardh. (EES) harvested from Lange coastal area (Aceh Besar). The bioactivity was estimated by conducting 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay followed by phenolic content measurement and infrared (IR) spectroscopy analysis to characterise the possible phytochemicals of the crude extract. The EES demonstrated a stronger free radical scavenging activity expressed in IC50 value of 2.178±0.117 µg/mL compared to other studies in the same species. Furthermore, the phenolic-related component was confirmed based on its phenolic content of 18.572±0.106 mg GAE/g and IR spectroscopy wavenumber of 3367.71 and 1624.06 cm−1 reflecting hydroxyl groups and aromatic rings, respectively. According to the finding, the brown algae from Lange could fairly be considered as a natural resource of antioxidants and phenolic bioactivities.
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