Efficient Lipid Bilayer Formation by Dipping Lipid-Loaded Microperforated Sheet in Aqueous Solution

Area of Science:

• Biophysics
• Membrane Science

Background:

• Bilayer lipid membranes (BLMs) are crucial for studying membrane proteins and cellular processes.
• Conventional BLM formation methods often involve organic solvents, limiting direct aqueous phase manipulation.

Purpose of the Study:

• To develop a novel, solvent-free method for bilayer lipid membrane (BLM) formation.
• To demonstrate the utility of the formed BLMs for direct chemical addition and nanopore studies.

Main Methods:

• Utilized a perforated sheet within an open chamber for BLM formation.
• Employed microscopic observation to characterize membrane morphology.
• Conducted electrical measurements using the membrane protein α-hemolysin to confirm BLM integrity and function.

Main Results:

• Successfully formed droplet interface bilayers using the perforated sheet method.
• Confirmed the formation of stable BLMs through characteristic nanopore electrical signatures.
• Demonstrated the absence of organic solvent layers, facilitating direct access to the aqueous phase.

Conclusions:

• The perforated sheet method offers a viable, solvent-free approach for BLM formation.
• This technique enhances the applicability of BLMs for direct chemical interactions and functional studies.
• The method is advantageous for applications requiring direct manipulation of the aqueous environment surrounding the membrane.