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 (H₂O₂) 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 H₂O₂ scavenging activities, reducing power, and metal ion-chelating abilities of SHE were significantly decreased (p < 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.

颗粒物是空气污染的主要来源，对人类健康有害。通过测量 1,1-二苯基-2-三硝基苯肼 (DPPH) 自由基清除活性、过氧化氢 (H ₂ O ₂ ）清除活性、超氧阴离子（O ^{· −} ₂ ）抑制、羟自由基（ ^· OH）清除活性、还原力和金属离子螯合作用。所有体外抗氧化活性均随着 SHE 浓度（0-1000 μg/mL）的增加而增加。当用0-1000 μg/mL的颗粒物处理时，SHE的DPPH自由基和H ₂ O ₂清除活性、还原力和金属离子螯合能力显着降低（ p < 0.05）。这些结果表明，马尾藻是生物活性化合物的丰富来源，可以用作食品工业中抗氧化剂的天然来源。