Main phase transition depression by incorporation of alkanols in DPPC vesicles in the gel state: Influence of the solute topology

Diphenylhexatriene is employed to sense the changes elicited in dipalmitoylphosphatidylcholine large unilamellar vesicles by the incorporation of several alkanols. From the dependence of the observed anisotropy values upon the surfactant concentration, pseudo partition constants of alkanols are obta...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 1996-03, Vol.108 (2), p.287-293
Main Authors: Aguilar, L.F., Sotomayor, C.P., Lissi, E.A.
Format: Article
Language:English
Subjects:
Alkanols
Chemistry
Colloidal state and disperse state
DPPC vesicles
Exact sciences and technology
Gel
General and physical chemistry
Membranes
Phase transition
Solute topology
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Summary:Diphenylhexatriene is employed to sense the changes elicited in dipalmitoylphosphatidylcholine large unilamellar vesicles by the incorporation of several alkanols. From the dependence of the observed anisotropy values upon the surfactant concentration, pseudo partition constants of alkanols are obtained under conditions in which the vesicles are intermediate between the gel and liquid crystalline states. These data, together with previous data obtained at lower alkanol concentrations, allow an evaluation of the dependence of the alkanol incorporation on the solute concentration. The effect of the solute topology is investigated by employing linear and highly branched alkanols.
ISSN:0927-7757
1873-4359
DOI:10.1016/0927-7757(95)03424-2