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Particulate matter is a major contribution of air pollution and detrimental to human health. The in vitro antioxidant activities of a brown seaweed, Sargassum horneri ethanol extract (SHE) against particulate matter-induced oxidative stress were investigated by measuring 1,1-diphenyl-2-picrylhydrazyl (DPPH) free-radical scavenging activity, hydrogen peroxide (H 2 O 2 ) scavenging activity, superoxide anion (O 2   · - ) inhibition, hydroxyl radical (  ·  OH) scavenging activity, reducing power, and the metal ion-chelating effect. All in vitro antioxidant activities were increased as the concentration of SHE increased (0-1000 μg/mL). When treated with particulate matter at 0-1000 μg/mL, the DPPH free radical, and H 2 O 2 scavenging activities, reducing power, and metal ion-chelating abilities of SHE were significantly decreased ( p  &lt; 0.05). These results indicate that Sargassum horneri , which is a rich source of bioactive compounds, can be used as a natural source of antioxidants in the food industries.

Antioxidant potential of Sargassum horneri extract against urban particulate matter-induced oxidation