Fig. 2
Schematic representation of the different types of lipid-based vesicular delivery systems. a Conventional liposomes generally consist of a lipid bilayer composed of phospholipids. b Ethosomes primarily composed of phospholipids and a high concentration of ethanol. c Transfersomes composed of edge acativators. d Niosomes consist of nonionic surfactant vesicles (adapted from after Hua 2015)