Abstract
Dipolar lipid membranes may adsorb multivalent ions. The binding constant depends on the type of lipid and ions. In this paper, we focus on the adsorption of calcium ions onto 1,2-dilauroylphosphatidylcholine (DLPC) membrane. Using small-angle-X-ray scattering we found that at ambient room temperature ca. 0.6 mM CaCl2 is a critical concentration at which calcium ions adsorbed to 30 mg/mL (ca. 48 mM) DLPC membrane. We then determined the structure of the lamellar phases formed at CaCl2 concentrations below and above the critical concentration and characterized the effect of temperature and incubation time on the adsorption process. Our findings suggest that calcium adsorption to DLPC membranes requires an initial nucleation phase.
Original language | American English |
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Pages (from-to) | 3390-3396 |
Number of pages | 7 |
Journal | Journal of Physical Chemistry A |
Volume | 120 |
Issue number | 19 |
DOIs | |
State | Published - 19 May 2016 |
Bibliographical note
Funding Information:This project was supported by Israel Science Foundation (1372/13) and by the Focal Technology Area Hybrid Nanomaterials program of the Planning and Budgeting Committee of the Israel Council of Higher Education.
Publisher Copyright:
© 2016 American Chemical Society.