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Vesicle solubilization by alkyl sulfate surfactants: A cryo-TEM study of the vesicle to micelle transition
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
1996 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 179, no 1, 104-113 p.Article in journal (Other academic) Published
Abstract [en]

The solubilization of small unilamellar lecithin vesicles by some different alkyl sulfate surfactants (C10SO4-, C12SO4-, and C14SO4-) was investigated by means of light scattering and cryo-transmission electron microscopy. All surfactants were found to induce vesicle growth at subsolubilizing concentrations and a transformation into small globular lipid/surfactant mixed micelles at high surfactant concentrations. The surfactant chain length, however, was found to have a profound influence both on the amount of surfactant needed for solubilization of the lipid bilayer and on the type of structures formed during the vesicle to micelle transition. For C10SO4- a coexistence between vesicles composed of normal lamellar (L(alpha)) phase and thread-like micelles was observed, whereas during solubilization with C12SO4- and C14SO4- an intermediate, presumably holey lamellar, phase appeared before the bilayers were eventually solubilized into lipid/surfactant mixed micelles. The above observations pertain to measurements made in buffer solutions containing 150 mM NaCl. Upon decreasing the salt concentration, disk-shaped micelles, and at higher surfactant concentration thread-like micelles, frequently connected via three-way junctions, were observed during solubilization with C12SO4-.

Place, publisher, year, edition, pages
1996. Vol. 179, no 1, 104-113 p.
Keyword [en]
alkyl sulfate surfactants, vesicle solubilization, discoidal micelles, thread-like micelles, three-way junctions, holey lamellar phase, cryo-TEM
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-75032DOI: 10.1006/jcis.1996.0192 |ISI: A1996UG88700011OAI: oai:DiVA.org:uu-75032DiVA: diva2:102942
Available from: 2006-12-19 Created: 2006-12-19 Last updated: 2011-04-07Bibliographically approved

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Karlsson, GöranEdwards, Katarina

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