Giant phospholipid vesicles: comparison among the whole lipid sample characteristics using different preparation...

Area of Science:

• Biophysics
• Materials Science
• Lipid Nanotechnology

Background:

• Giant unilamellar vesicles (GUVs) are crucial model systems in biophysics.
• Understanding GUV formation is key to their application in drug delivery and biomimetic studies.
• Phosphatidylcholine phospholipids are commonly used for GUV synthesis.

Purpose of the Study:

• To evaluate and compare different preparation methods for synthetic phosphatidylcholine GUVs.
• To analyze the impact of preparation techniques on GUV physical characteristics.
• To identify optimal methods for producing GUVs with desired properties.

Main Methods:

• Comparison of multiple GUV preparation techniques.
• Utilizing two-photon excitation fluorescence microscopy with sectioning capabilities.
• Analysis of lamellarity, morphology, vesicle size, internal shape, and shell thickness.
• Lipid sample labeling with 6-lauroyl-2-(N,N-dimethylamino)naphtalene (LAURDAN) for lipid packing analysis.

Main Results:

• Vesicle size, internal shape, and shell thickness are dependent on the preparation method.
• Preparation using external electric fields yielded approximately 95% GUVs with narrow size distribution.
• Lipid tethers, structurally similar to vesicles, were observed across all preparation methods.
• LAURDAN generalized polarization function indicated similar lipid packing in vesicles and tethers.

Conclusions:

• Electrically assisted GUV preparation is highly efficient and yields uniform vesicles.
• Lipid tethers exhibit comparable stability and lipid packing to GUVs.
• The findings provide insights into optimizing GUV production for research and applications.