Definition of Liposome

A liposome is a vesicle that is composed of one or more than one bilayers of phospholipids. These phospholipids are much similar to those present in the cell membrane. Liposomes occur in the spherical form and have the tendency to provide encapsulation to lipophilic as well as hydrophilic drugs. In this way, the drugs are delivered to the desired location safely.


The liposomes are composed of phospholipids and mixed lipid chains. Their size varies from 0.025 to 2.5 micrometres. These liposomes are classified into two forms i.e. multilamellar vesicles and unilamellar vesicles. Multiple bilayers of phospholipids are present in the former type and unilamellar liposomes consist of only one phospholipid bilayer in which the aqueous solution is enclosed.

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