Interaction of Moringa oleifera seed protein with a mineral surface and the influence of surfactants
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
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.
Cetyltrimethylammonium bromide, Moringa oleifera, Neutron reflection, Reflectivity, Sapphire, Seed protein, Sodium dodecylsulfate, Surface excess
IdentifiersURN: urn:nbn:se:uu:diva-264334DOI: 10.1016/j.jcis.2015.02.033ISI: 000360592100042PubMedID: 25746187OAI: oai:DiVA.org:uu-264334DiVA: diva2:860924
FunderSwedish Research Council