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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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Methods for Generating Highly Magnetically Responsive Lanthanide-Chelating Phospholipid Polymolecular Assemblies.

Stéphane Isabettini1, Mirjam E Baumgartner1, Pernille Q Reckey1

  • 1Laboratory of Food Process Engineering, ETH Zurich , Schmelzbergstrasse 9, 8092 Zurich, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 9, 2017
PubMed
Summary
This summary is machine-generated.

A simplified method for creating magnetically responsive lipid assemblies using gentle heating and cooling cycles has been developed. This new technique enhances the formation and magnetic responsiveness of lanthanide ion chelating phospholipid polymolecular assemblies.

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Area of Science:

  • Soft Matter Science
  • Materials Chemistry
  • Biophysics

Background:

  • Lanthanide ion chelating phospholipid conjugates, like DMPE-DTPA, form magnetically responsive polymolecular assemblies with lipids such as DMPC.
  • Existing methods for fabricating these assemblies, including bicelles and cholesterol-containing bilayers, are often tedious and limit magnetic alignability.
  • The precise control over assembly formation is crucial for developing advanced soft materials.

Purpose of the Study:

  • To develop a simplified and efficient fabrication procedure for highly magnetically responsive lanthanide ion chelating phospholipid polymolecular assemblies.
  • To investigate the role of controlled heating and cooling cycles in the formation of these assemblies.
  • To improve the magnetic alignability and regeneration of stored lipid-based magnetic materials.

Main Methods:

  • A novel hydration technique involving gentle heating and cooling cycles above and below the lipid phase transition temperature (Tm) was employed, replacing traditional freeze-thawing and extrusion.
  • The formation of DMPC/DMPE-DTPA/Ln3+ (4:1:1) and DMPC/Cholesterol/DMPE-DTPA/Ln3+ (16:4:5:5) assemblies was optimized using this method.
  • The magnetic responsiveness and stability of the regenerated assemblies after storage were evaluated.

Main Results:

  • Successful formation of planar polymolecular assemblies (hundreds of nanometers) with significantly enhanced magnetic response was achieved.
  • Heating above the lipid Tm followed by cooling below Tm was essential for proper assembly formation.
  • The simplified procedure effectively regenerated highly magnetically alignable DMPC/Cholesterol/DMPE-DTPA/Ln3+ assemblies after one month of frozen storage.

Conclusions:

  • A simplified, gentle heating and cooling method efficiently produces highly magnetically responsive lanthanide ion chelating phospholipid polymolecular assemblies.
  • This procedure overcomes limitations of traditional methods, offering improved magnetic alignability and material regeneration.
  • The developed technique provides a viable route for creating advanced building blocks for future smart soft materials.