Cellular Antioxidant Effect of Four Bromophenols from the Red Algae, Vertebrata lanosa
作者:Elisabeth Olsen、Espen Hansen、Johan Isaksson、Jeanette Andersen
DOI:10.3390/md11082769
日期:——
Three known bromophenols, 2,3-dibromo-4,5-dihydroxybenzylaldehyde (1), 2,2′,3-tribromo-3′,4,4′,5-tetrahydroxy-6′-hydroxymethyldiphenylmethane (2) and bis(2, 3-dibromo-4,5-dihydroxylbenzyl) ether (3), and one new one, 5,5″-oxybis(methylene)bis (3-bromo-4-(2′,3′-dibromo-4′,5′-dihydroxylbenzyl)benzene-1,2-diol) (4), were isolated from an extract of the red alga, Vertebrata lanosa. The antioxidant activity of these four bromophenols was examined using one biochemical and two cellular assays: Oxygen Radical Absorbance Capacity (ORAC), Cellular Antioxidant Activity (CAA) and Cellular Lipid Peroxidation Antioxidant Activity (CLPAA) assays. Compound 2 distinguished itself by showing potent activity, having a better antioxidant effect than luteolin in both the CAA and CLPAA assays and of quercetin in the CLPAA assay. Although several bromophenols are known to be potent antioxidants in biochemical assays, this is the first time their cellular antioxidant activity has been demonstrated.
三种已知的溴苯酚:2,3-二溴-4,5-二羟基苄醛(1)、2,2′,3-三溴-3′,4,4′,5-四羟基-6′-羟甲基二苯甲烷(2)和双(2,3-二溴-4,5-二羟基苄基)醚(3)、和双(2,3-二溴-4,5-二羟基苄基)醚(3),以及一种新的 5,5″-氧双(亚甲基)双(3-溴-4-(2′,3′-二溴-4′,5′-二羟基苄基)苯-1,2-二醇)(4)是从红藻 Vertebrata lanosa 的提取物中分离出来的。这四种溴酚类化合物的抗氧化活性通过一种生化试验和两种细胞试验进行了检测:氧自由基吸收能力(ORAC)、细胞抗氧化活性(CAA)和细胞脂质过氧化抗氧化活性(CLPAA)测定。化合物 2 显示出了强大的活性,其抗氧化效果在 CAA 和 CLPAA 试验中均优于木犀草素,在 CLPAA 试验中优于槲皮素。虽然已知几种溴酚类化合物在生化试验中是强效抗氧化剂,但这是它们的细胞抗氧化活性首次得到证实。