Abstract
The pattern of disease development has shifted from infectious diseases to degenerative diseases that are triggered by a free radical. The body needs an antioxidant that able to ward off free radicals. One of the potential natural resources is brown algae that contain bioactive compounds and widely used in medicine and the pharmaceutical industry. This research aims to identify the effectiveness of brown algae (Padina australis) extract as a natural antioxidant agent. This research was carried out in several steps, including algae extraction by sonicator method, phytochemical test to identify secondary metabolites in extract and antioxidant test by using DPPH method. The results showed that the extract of brown algae (Padina australis) contained flavonoids, alkaloids, saponin, and steroids. It also has antioxidant activity with an IC50 value of 102,590 µg/mL.
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