Droplet interface bilayer (DIB) is a method of fabricating lipid bilayer membrane by contacting two aqueous droplets coated with a monolayer of lipid molecules in oil media. Lipids coat the droplet surface either by vesicles fusing to the water-oil interface from the droplet side or diffusing toward the interface from the oil side, thereby forming a lipid monolayer. With the DIB technique, nanoliter amounts of aqueous solution is needed and one may obtain two different compositions of monolayers to form asymmetric bilayer which is difficult to replicate by other in vitro lipid membrane methods. Here, a DIB-based protocol is reported to fabricate a stable lipid bilayer membrane to perform single-channel electrophysiology on a pore-forming toxin.
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