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Dry Two-Step Self-Assembly of Stable Supported Lipid Bilayers on Silicon Substrates
Marcelo A Cisternas1,2, Francisca Palacios-Coddou1,2, Sebastian Molina1,2
1Instituto de Fisica, Pontificia Universidad Catolica de Chile, Santiago 7820436, Chile.
International Journal of Molecular Sciences
|September 22, 2020
Summary
Researchers developed a novel dry self-assembly method to create stable, non-hydrated supported lipid bilayers. This technique offers a promising route for advanced biointerfaces and biosensors, demonstrating long-term stability in dry conditions.
Area of Science:
- Materials Science
- Biophysics
- Surface Chemistry
Background:
- Artificial membranes serve as crucial models for biological systems and find applications in various fields.
- Supported lipid bilayers are essential for creating functional biointerfaces, biosensors, and membrane protein platforms.
- Existing methods for creating supported lipid bilayers often require wet environments, limiting their application and stability.
Purpose of the Study:
- To introduce and characterize a novel dry, two-step self-assembly method for creating stable, non-hydrated supported lipid bilayers.
- To investigate the phase transitions and structural properties of these dry lipid bilayers using advanced experimental techniques.
- To assess the long-term stability and potential applications of these dry supported lipid bilayers.
Main Methods:
- High-vacuum evaporation of dipalmitoylphosphatidylcholine (DPPC) molecules onto bare silicon.
- Subsequent annealing step in air to form supported lipid bilayers without solvents or polymer cushions.
- High-resolution ellipsometry and Atomic Force Microscopy (AFM) for temperature-dependent measurements.
- AFM force-spectroscopy to analyze single- and multi-bilayer formation and bilayer restructuring.
Main Results:
- Successful formation of stable, non-hydrated supported lipid bilayers using the dry self-assembly method.
- Characteristic phase transitions of DPPC bilayers were observed: gel to ripple (311.5 ± 0.9 K), ripple to liquid crystalline (323.8 ± 2.5 K), and liquid crystalline to fluid disordered (330.4 ± 0.9 K).
- AFM tip-induced restructuring and intercalation of the bilayer were observed, dependent on applied tip force.
- Demonstrated long-term stability of the dry supported lipid bilayers.
Conclusions:
- The dry two-step self-assembly method effectively produces stable, non-hydrated supported lipid bilayers with properties comparable to those formed in wet environments.
- These dry supported lipid bilayers exhibit significant long-term stability, making them suitable for applications in dry environments.
- The findings pave the way for the development of advanced functional biointerfaces, biosensors, and membrane protein platforms with enhanced durability.
