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A Versatile Method of Patterning Proteins and Cells
Published on: February 26, 2017
Soft lithographic patterning of supported lipid bilayers onto a surface and inside microfluidic channels
Pilnam Kim1, Sang Eun Lee, Ho Sup Jung
1School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742, Korea.
Lab on a Chip
|December 24, 2005
Summary
Simple soft lithography methods create patterned supported lipid bilayer (SLB) membranes. These techniques significantly reduce lipid adsorption and enable functional SLB arrays for biosensing applications.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Microfluidics
Background:
- Supported lipid bilayers (SLBs) are crucial for mimicking cell membranes.
- Controlling lipid adsorption and patterning SLBs on surfaces and in microfluidic devices remains challenging.
Purpose of the Study:
- To develop simple soft lithographic methods for patterning SLBs.
- To reduce non-specific lipid adsorption in microfluidic channels and on surfaces.
- To create functional SLB arrays for biosensing applications.
Main Methods:
- Fabrication of micropatterns using polyethylene glycol (PEG)-based polymers via microcontact printing or capillary molding.
- Characterization of lipid adsorption using atomic force microscopy (AFM).
- Assessment of SLB functionality through ligand-receptor binding assays.
Main Results:
- PEG-patterned surfaces reduced lipid adsorption by 97% on 2D surfaces and 95% in microfluidic channels.
- Vesicle fusion on exposed substrates formed SLBs, confirmed by AFM.
- Functional SLB arrays with spatial resolution down to 500 nm (flat substrate) and 1 µm (microfluidic channels) were achieved.
Conclusions:
- Soft lithography offers an effective approach for patterning SLBs with reduced lipid adsorption.
- The developed methods enable the creation of high-resolution, functional SLB arrays for microfluidic and surface-based applications.
- This work advances the development of biomimetic surfaces for biosensing and cell membrane studies.
