作者:SHIRO URANO、SHINJU YAMANOI、MITSUYOSHI MATSUO
DOI:10.1248/cpb.29.1162
日期:——
The reactivity of some tocopherols (vitamin E) with the methyl radical was examined. When the methyl radical was generated from dimethyl sulfoxide by the action of hydrogen peroxide in the presence of ferrous sulfate, either β-tocopherol or γ-tocopherol reacted with it to give the corresponding methyl ether and 2, 5, 5, 7, 8-pentamethyl-2-(4, 8, 12-trimethyltridecyl) chroman-6 (5H)-one in Iow yields. Tocol afforded only a small amount of its methyl ether. On the other hand, 5, 7-dimethyltocol was converted to its methyl ether and 2, 5, 5, 7-tetramethyl-2-(4, 8, 12-trimethyltridecyl) chroman-6 (5H)-one in 9 and 38% yields, respectively. Taken with the previous data on α-tocopherol, these results indicate that the radical scavenging abilities of tocopherols against the methyl radical are in the following order : α-tocopherol≥5, 7-dimethyltocol>β-tocopherol=γ-tocopherol≥tocol.
研究了一些生育酚(维生素 E)与甲基自由基的反应性。当过氧化氢在硫酸亚铁的作用下从二甲基亚砜中生成甲基自由基时,β-生育酚或γ-生育酚都会与其发生反应,生成相应的甲基醚和 2, 5, 5, 7, 8-五甲基-2-(4, 8, 12-三甲基十三烷基)色曼-6 (5H)-酮,产率为 Iow。Tocol 只提供了少量的甲基醚。另一方面,5, 7-二甲基 Tocol 被转化为其甲基醚和 2, 5, 5, 7-四甲基-2-(4, 8, 12-三甲基十三烷基)色曼-6 (5H)-酮,收率分别为 9% 和 38%。结合之前关于 α-生育酚的数据,这些结果表明生育酚清除甲基自由基的能力按以下顺序排列:α-生育酚≥5, 7-二甲基色醇>β-生育酚=γ-生育酚≥色醇。