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Interaction of Moringa oleifera seed protein with a mineral surface and the influence of surfactants
Polytech Namibia, Sch Hlth & Appl Sci, Windhoek, Namibia..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Inst Laue Langevin, F-38042 Grenoble 9, France..ORCID iD: 0000-0002-8645-5385
2015 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 448, 339-346 p.Article in journal (Refereed) Published
Abstract [en]

The paper describes the adsorption of purified protein from seeds of Moringa olelfera to a sapphire interface and the effects of addition of the anionic surfactant sodium dodecylsulfate (SOS) and the cationic surfactant hexadecyltrimethylammonium bromide (CTAB). Neutron reflection was used to determine the structure and composition of interfacial layers adsorbed at the solid/solution interface. The maximum surface excess of protein was found to be about 5.3 mg m(-2). The protein does not desorb from the solid/liquid interface when rinsed with water. Addition of SDS increases the reflectivity indicating co-adsorption. It was observed that CTAB is able to remove the protein from the interface. The distinct differences to the behavior observed previously for the protein at the silica/water interface are identified. The adsorption of the protein to alumina in addition to other surfaces has shown why it is an effective flocculating agent for the range of impurities found in water supplies. The ability to tailor different surface layers in combination with various surfactants also offers the potential for adsorbed protein to be used in separation technologies.

Place, publisher, year, edition, pages
2015. Vol. 448, 339-346 p.
Keyword [en]
Cetyltrimethylammonium bromide, Moringa oleifera, Neutron reflection, Reflectivity, Sapphire, Seed protein, Sodium dodecylsulfate, Surface excess
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-264334DOI: 10.1016/j.jcis.2015.02.033ISI: 000360592100042PubMedID: 25746187OAI: oai:DiVA.org:uu-264334DiVA: diva2:860924
Funder
Swedish Research Council
Available from: 2015-10-14 Created: 2015-10-09 Last updated: 2017-12-01Bibliographically approved

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