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The distribution was determined by employing a recently developed a kinetic method, based on the reaction between the hydrophobic 4\u2010hexadecylbenzenediazonium ions (16\u2010<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/ejlt201600274-math-0010.png\" xlink:title=\"urn:x-wiley:14381656:media:ejlt201600274:ejlt201600274-math-0010\"\/>) and the antioxidants, that allows to determine the partition constants between the oil\u2010interfacial, <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/ejlt201600274-math-0011.png\" xlink:title=\"urn:x-wiley:14381656:media:ejlt201600274:ejlt201600274-math-0011\"\/>, and water\u2010interfacial, <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/ejlt201600274-math-0012.png\" xlink:title=\"urn:x-wiley:14381656:media:ejlt201600274:ejlt201600274-math-0012\"\/>, regions of the emulsion and their interfacial molarities. Our results show that: (i) at low surfactant volume fractions, <jats:italic>\u03a6<\/jats:italic><jats:sub>I<\/jats:sub>\u2009=\u20090.005, a significant fraction (&gt;50%) of all protocatechuates is located in the interfacial region of soybean oil emulsions. The percentage increases with increasing <jats:italic>\u03a6<\/jats:italic><jats:sub>I<\/jats:sub> such that at <jats:italic>\u03a6<\/jats:italic><jats:sub>I<\/jats:sub>\u2009=\u20090.04, than 90% of the AOs are located in the interfacial region; (ii) the variation of the hydrophobicity of the AOs has a modest effect on their concentration in the interfacial region, particularly at <jats:italic>\u03a6<\/jats:italic><jats:sub>I\u2009<\/jats:sub>&gt;\u20090.01, and an almost negligible effect on their antioxidant efficiency in the same emulsions; (iii) a positive correlation between the antioxidant efficiency and the interfacial molarities of the protecatechuates was established.<\/jats:p><jats:p><jats:bold>Practical application:<\/jats:bold> Results will contribute to a deeper understanding of oxidative stability in polyunsaturated acids enriched emulsions, will enhance current understanding of how AO structure and physical location within the food system affect their efficiency and will provide basic information on the factors controlling AO distributions and efficiencies, allowing a more rational selection of AOs in food stabilization. The outcome of this research will help the development of more efficient antioxidant strategies for food preservation and for the oxidative protection of nutritionally important bioactive lipids.<\/jats:p><jats:p><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/ejlt201600274-gra-0009.png\" xlink:title=\"ejlt201600274-gra-0009\"\/><\/jats:p><jats:p>There is a positive correlation between the antioxidant efficiency of protocatechuates of different HLB and their interfacial concentration, (AO<jats:sub>I<\/jats:sub>), in soybean oil emulsions.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ejlt.201600274","type":"journal-article","created":{"date-parts":[[2017,4,20]],"date-time":"2017-04-20T09:59:28Z","timestamp":1492682368000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Partitioning and antioxidative effect of protocatechuates in soybean oil emulsions: Relevance of emulsifier concentration"],"prefix":"10.1002","volume":"119","author":[{"given":"Rui","family":"Silva","sequence":"first","affiliation":[{"name":"REQUIMTE\u2010LAQV Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias Universidade do Porto Porto Portugal"}]},{"given":"Sonia","family":"Losada\u2010Barreiro","sequence":"additional","affiliation":[{"name":"REQUIMTE\u2010LAQV Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias Universidade do Porto Porto Portugal"},{"name":"Faculty of Chemistry Department of Physical Chemistry University of Vigo Vigo Spain"}]},{"given":"F\u00e1tima","family":"Paiva\u2010Martins","sequence":"additional","affiliation":[{"name":"REQUIMTE\u2010LAQV Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias Universidade do Porto Porto Portugal"}]},{"given":"Carlos","family":"Bravo\u2010D\u00edaz","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry Department of Physical Chemistry University of Vigo Vigo Spain"}]}],"member":"311","published-online":{"date-parts":[[2017,5,15]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1533\/9780857097927"},{"volume-title":"Lipid Oxidation Pathways","year":"1999","author":"Genot C.","key":"e_1_2_7_3_1"},{"key":"e_1_2_7_4_1","first-page":"431","volume-title":"Bailey's Industrial Oil and Fat Products","author":"Wanasundara P. 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