作者:Farah S. Hosseinian、Alister D. Muir、Neil D. Westcott、Ed S. Krol
DOI:10.1039/b617426d
日期:——
Secoisolariciresinol (SECO 1) is the major lignan found in flaxseed (Linum usitatissimum L.) and is present in a polymer that contains secoisolariciresinol diglucoside (SDG 2). SECO, SDG and the polymer are known to have a number of health benefits, including reduction of serum cholesterol levels, delay in the onset of type II diabetes and decreased formation of breast, prostate and colon cancers. The health benefits of SECO and SDG may be partially attributed to their antioxidant properties. To better understand their antioxidant properties, SECO and SDG were oxidized using 2,2′-azobis(2-amidinopropane), an in vitro model of radical scavenging. The major lignan radical-scavenging oxidation products and their formation over time were determined. SDG was converted to four major products (11–14), which were the result of a phenoxyl radical intermediate. One of these products (13), a dimer of SDG, decomposed under the reaction conditions to form two of the other major products, 12 and 14. SECO was converted to five major products (6–10), two of which (6 and 7) were also the result of a phenoxyl radical intermediate. The remaining products (8, 9 and 10) were the result of an unexpected alkoxyl radical intermediate. The phenol oxidation products were stable under the reaction conditions, whereas two of the alcohol oxidation products (8 and 9) decomposed. In general, only one phenol group on the lignans was oxidized, suggesting that the number of phenols per molecule may not predict radical scavenging antioxidant ability of lignans. Finally, SECO is a superior antioxidant to SDG, and it may be that the additional alcohol oxidation pathway contributes to its greater antioxidant ability.
开环异落叶松树脂醇 (SECO 1) 是亚麻籽 (Linum usitatissimum L.) 中发现的主要木酚素,存在于含有开环异落叶松树脂醇二葡萄糖苷 (SDG 2) 的聚合物中。众所周知,SECO、SDG 和聚合物具有许多健康益处,包括降低血清胆固醇水平、延缓 II 型糖尿病的发病以及减少乳腺癌、前列腺癌和结肠癌的形成。 SECO 和 SDG 的健康益处可能部分归因于它们的抗氧化特性。为了更好地了解它们的抗氧化特性,使用自由基清除的体外模型 2,2'-偶氮双(2-脒基丙烷) 氧化 SECO 和 SDG。测定了主要的木脂素自由基清除氧化产物及其随时间的形成。 SDG 转化为四种主要产物 (11-14),它们是苯氧基自由基中间体的结果。其中一种产物 (13) 是 SDG 的二聚体,在反应条件下分解形成另外两种主要产物 12 和 14。SECO 转化为五种主要产物 (6–10),其中两种(6 和 14) 7)也是苯氧基自由基中间体的结果。剩余的产物(8、9 和 10)是意想不到的烷氧基中间体的结果。苯酚氧化产物在反应条件下是稳定的,而两种醇氧化产物(8和9)分解了。一般来说,木脂素上只有一个酚基团被氧化,这表明每个分子中酚的数量不能预测木脂素的自由基清除抗氧化能力。最后,SECO 是一种优于 SDG 的抗氧化剂,可能是额外的醇氧化途径有助于其更强的抗氧化能力。