Adsorption of octanoic acid at the water/oil interface |
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| Institution: | 1. Technische Universität Berlin, Fachgebiet für Lebensmittelbiotechnologie und -prozesstechnik, Königin-Luise-Str. 22, 14195 Berlin, Germany;2. MPI für Kolloid- und Grenzflächenforschung, Forschungscampus Golm, 14476 Golm/Potsdam, Germany;3. Nestlé Research Center, CH-1000 Lausanne 26, Switzerland;1. SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China;2. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;1. Department of Physics, University of the Free State, QwaQwa Campus, Private Bag X13, Phuthaditjhaba 9866, South Africa;2. Department of Physics, University of the Free State, P O Box 339, Bloemfontein ZA-9300, South Africa;1. Department of Analytical and Inorganic Chemistry, Faculty of Chemistry, University of Concepcion, Chile;2. Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600025, Tamil Nadu, India;3. CSIR Central Electrochemical Research Institute-Chennai Unit, CSIR-Madras Complex, Taramani, Chennai 600113, India;4. Department of Materials Engineering, Faculty of Engineering, University of Concepcion, Chile;5. Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai 600025, Tamil Nadu, India |
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| Abstract: | Fats are widely present in a large variety of food and represent the main source of energy for the body. In the current study we investigate the behaviour of fatty acids at liquid–liquid interfaces, mimicking some steps of the very complex digestion process. Octanoic acid is used as an example of middle chain fatty acids. For the oil phase we choose sunflower oil as an industrial product and hexane as pure oil.The influence of the fatty acid concentration and the pH of the aqueous phase on the interfacial tension is determined by profile analyse tensiometry (PAT), which allows to examine the way of adsorption and transition of the fatty acids from one phase to the other. Predominantly, the pH affects the dissociation and thereby the strength of the hydrophilic character of the fatty acid. The adsorption behaviour indicates the different interfacial activity of the studied octanoic acid. |
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