Measurements of Singlet Oxygen-Quenching Activity of Vitamin E Homologs and Palm Oil and Soybean Extracts in a Micellar Solution

Lipids
Kazuo MukaiKatsuhiro Izumisawa

Abstract

Recently, a new assay method that can quantify the singlet oxygen-absorption capacity (SOAC) of antioxidants (AO) and food extracts in homogeneous organic solvents has been proposed. In the present study, second-order rate constants (kQ ) for the reaction of singlet oxygen (1 O2 ) with vitamin E homologs (α-, β-, γ-, and δ-tocopherols [Toc] and α-, β-, γ-, and δ-tocotrienols [Toc-3]) were measured in an aqueous Triton X-100 (5.0 wt%) micellar solution (pH 7.4). Toc-3 showed kQ values larger than those of Toc in a micellar solution, although Toc and Toc-3 showed the same kQ values in a homogeneous solution. Similar measurements were performed for 5 palm oil extracts 1-5 and one soybean extract 6, which contained different concentrations of Toc, Toc-3, and carotenoids. It has been clarified that the 1 O2 -quenching rates (kQ ) (that is, the relative SOAC value) obtained for extracts 3-6 may be explained as the sum of the product <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfenced><mml:mrow><mml:mi>Σ</mml:mi><mml:msubsup><mml:mi>k</mml:mi><mml:mi>Q</mml:mi><mml:mrow><mml:mi>AO</mml:mi><mml:mo>-</mml:mo><mml:mi>i</mml:mi></mml:mrow></mml:msubsup><mml:mfenced><mml:mrow><mml:mi>AO</mml:mi><mml:mo>-</mml:mo><mml:mi>i...Continue Reading

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Citations

Sep 3, 2019·Journal of Nutritional Science and Vitaminology·Kazuo Mukai
Oct 19, 2020·Advances in Colloid and Interface Science·Anna MagriTomy J Gutiérrez

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