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Oxidation potential in acetonitrile determined by cyclic voltammetry and ionization potential calculated by density functional theory for the aldehydes and dyads (conjugates), of which the two longer are new, decreased linearly with the wavenumber for absorption maximum. The logarithm of the second-order rate constant for scavenging of the ABTS\u2022+ increased linearly with decreasing oxidation potential suggesting that longer conjugation in the antioxidant increases the rate of electron transfer. A similar linear free energy relationship was found for the rate of scavenging DPPH\u2022, including daidzein, which may indicate involvement of hydrogen atom transfer from an isoflavonoid phenol. Prediction of radical scavenging efficiency from visible absorption spectra was demonstrated with the perspective of rational design of bifunctional amphiphilic antioxidants.<\/jats:p>","DOI":"10.1021\/acsomega.0c00925","type":"journal-article","created":{"date-parts":[[2020,6,1]],"date-time":"2020-06-01T14:21:05Z","timestamp":1591021265000},"page":"13770-13776","source":"Crossref","is-referenced-by-count":4,"title":["Conjugation Length Dependence of Free Radical Scavenging\nEfficiency of Retinal and Retinylisoflavonoid Homologues"],"prefix":"10.1021","volume":"5","author":[{"given":"Yang-Lin","family":"Jiang","sequence":"first","affiliation":[{"name":"Renmin University of China , , ,","place":["Beijing, China, 100872"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bai-Ling","family":"Chen","sequence":"additional","affiliation":[{"name":"Renmin University of China , , ,","place":["Beijing, China, 100872"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao-Kun","family":"Yan","sequence":"additional","affiliation":[{"name":"Renmin University of China , , ,","place":["Beijing, China, 100872"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4723-6312","authenticated-orcid":true,"given":"Yi","family":"Xu","sequence":"additional","affiliation":[{"name":"Renmin University of China , , ,","place":["Beijing, China, 100872"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen-Chen","family":"Zhao","sequence":"additional","affiliation":[{"name":"Renmin University of China , , ,","place":["Beijing, China, 100872"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0473-6395","authenticated-orcid":true,"given":"Zi-Li","family":"Chen","sequence":"additional","affiliation":[{"name":"Renmin University of China , , ,","place":["Beijing, China, 100872"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7019-9885","authenticated-orcid":true,"given":"Peng","family":"Wang","sequence":"additional","affiliation":[{"name":"Renmin University of China , , ,","place":["Beijing, China, 100872"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9216-2386","authenticated-orcid":true,"given":"Jian-Ping","family":"Zhang","sequence":"additional","affiliation":[{"name":"Renmin University of China , , ,","place":["Beijing, China, 100872"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1734-5016","authenticated-orcid":true,"given":"Leif H.","family":"Skibsted","sequence":"additional","affiliation":[{"name":"University of Copenhagen , , Rolighedsvej 30, Frederiksberg C , ,","place":["Frederiksberg, Denmark, 1958"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2020,6,1]]},"reference":[{"key":"2026090207314366900_cit1","doi-asserted-by":"publisher","first-page":"1437","DOI":"10.1016\/j.foodchem.2009.01.074","article-title":"Antioxidant\nsynergism between carotenoids in membranes. 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