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Antioxidant activity of the flaxseed lignan secoisolariciresinol diglycoside and its mammalian lignan metabolites enterodiol and enterolactone

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Abstract

The antioxidant activities of the flaxseed lignan secoisolariciresinol diglycoside (SDG) and its mammalian lignan metabolites, enterodiol (ED) and enterolactone (EL), were evaluated in both lipid and aqueous in vitro model systems. All three lignans significantly (p ≤ 0.05) inhibited the linoleic acid peroxidation at both 10 and 100 μM over a 24-48 h of incubation at 40°C. In a deoxyribose assay, which evaluates the non site-specific and site-specific Fenton reactant-induced ·OH scavenging activity, SDG demonstrated the weakest activity compared to ED and EL at both 10 and 100 μM; the greatest ·OH scavenging for ED and EL was observed at 100 μM in both assays. The incubation of pBR322 plasmid DNA with Fenton reagents together with SDG, ED or EL showed that the inhibition of DNA scissions was concentration dependent. The greatest non site-specific activity of lignans was at 100 μM, thus, confirming the results of the deoxyribose test. In contrast, the protective effect of SDG and EL in the site-specific assay was lost and that of ED was minimal. Therefore, the results indicate a structure-activity difference among the three lignans with respect to specific antioxidant efficacy. All three lignans did not exhibit reducing activity compared to ascorbic acid, therefore, did not possess indirect prooxidant activity related to potential changes in redox state of transition metals. The efficacy of SDG and particularly the mammalian lignans ED and EL to act as antioxidants in lipid and aqueous in vitro model systems, at relatively low concentrations (i.e. 100 μM), potentially achievable in vivo, is an evidence of a potential anticarcinogenic mechanism of flaxseed lignan SDG and its mammalian metabolites ED and EL.

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Authors and Affiliations

  1. Food, Nutrition, and Health, Faculty of Agricultural Science, University of British Columbia, Vancouver, BC, Canada, V6T 1Z4

    D.D. Kitts & A.N. Wijewickreme

  2. Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, ON, Canada, M5S 3E2

    Y.V. Yuan & L.U. Thompson

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  1. D.D. Kitts
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  2. Y.V. Yuan
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  3. A.N. Wijewickreme
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  4. L.U. Thompson
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Kitts, D., Yuan, Y., Wijewickreme, A. et al. Antioxidant activity of the flaxseed lignan secoisolariciresinol diglycoside and its mammalian lignan metabolites enterodiol and enterolactone. Mol Cell Biochem 202, 91–100 (1999). https://doi.org/10.1023/A:1007022329660

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