{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,2]],"date-time":"2025-11-02T10:34:17Z","timestamp":1762079657446,"version":"build-2065373602"},"reference-count":42,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2018,8,28]],"date-time":"2018-08-28T00:00:00Z","timestamp":1535414400000},"content-version":"vor","delay-in-days":88,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["KAKENHI Grant 15\u2009K07431"],"award-info":[{"award-number":["KAKENHI Grant 15\u2009K07431"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["aocs.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Lipids"],"published-print":{"date-parts":[[2018,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Recently, a new assay method that can quantify the singlet oxygen\u2010absorption capacity (SOAC) of antioxidants (AO) and food extracts in homogeneous organic solvents has been proposed. In the present study, second\u2010order rate constants (<jats:italic>k<\/jats:italic><jats:sub>Q<\/jats:sub>) for the reaction of singlet oxygen (<jats:sup>1<\/jats:sup>O<jats:sub>2<\/jats:sub>) with vitamin E homologs (\u03b1\u2010, \u03b2\u2010, \u03b3\u2010, and \u03b4\u2010tocopherols [Toc] and \u03b1\u2010, \u03b2\u2010, \u03b3\u2010, and \u03b4\u2010tocotrienols [Toc\u20103]) were measured in an aqueous Triton X\u2010100 (5.0\u2009wt%) micellar solution (pH\u20097.4). Toc\u20103 showed <jats:italic>k<\/jats:italic><jats:sub>Q<\/jats:sub> values larger than those of Toc in a micellar solution, although Toc and Toc\u20103 showed the same <jats:italic>k<\/jats:italic><jats:sub>Q<\/jats:sub> values in a homogeneous solution. Similar measurements were performed for 5 palm oil extracts 1\u20135 and one soybean extract 6, which contained different concentrations of Toc, Toc\u20103, and carotenoids. It has been clarified that the <jats:sup>1<\/jats:sup>O<jats:sub>2<\/jats:sub>\u2010quenching rates (<jats:italic>k<\/jats:italic><jats:sub>Q<\/jats:sub>) (that is, the relative SOAC value) obtained for extracts 3\u20136 may be explained as the sum of the product <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/lipd12053-math-0002.png\" xlink:title=\"urn:x-wiley:00244201:media:lipd12053:lipd12053-math-0002\"\/> of the rate constant (<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/lipd12053-math-0003.png\" xlink:title=\"urn:x-wiley:00244201:media:lipd12053:lipd12053-math-0003\"\/>) and the concentration ([AO\u2010<jats:italic>i<\/jats:italic>]\/100) of AO\u2010<jats:italic>i<\/jats:italic> contained. The UV\u2013vis absorption spectra of Toc and Toc\u20103 were measured in a micellar solution and chloroform. The results obtained demonstrated that the <jats:italic>k<\/jats:italic><jats:sub>Q<\/jats:sub> values of AO in homogeneous and heterogeneous solutions vary notably depending on (1) polarity (dielectric constant [<jats:italic>\u03b5<\/jats:italic>]) of the reaction field between <jats:sup>1<\/jats:sup>O<jats:sub>2<\/jats:sub> and AO, (2) the local concentration of AO, and (3) the mobility of AO in solution. The results suggest that the SOAC method is applicable to the measurement of <jats:sup>1<\/jats:sup>O<jats:sub>2<\/jats:sub>\u2010quenching activity of general food extracts in a heterogeneous micellar solution.<\/jats:p>","DOI":"10.1002\/lipd.12053","type":"journal-article","created":{"date-parts":[[2018,8,30]],"date-time":"2018-08-30T00:54:14Z","timestamp":1535590454000},"page":"601-613","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Measurements of Singlet Oxygen\u2010Quenching Activity of Vitamin E Homologs and Palm Oil and Soybean Extracts in a Micellar Solution"],"prefix":"10.1002","volume":"53","author":[{"given":"Kazuo","family":"Mukai","sequence":"first","affiliation":[{"name":"Department of Chemistry, Faculty of Science Ehime University  Matsuyama 790\u20108577 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