Liposomes are phospholipid vesicles of nano- or microsize, dispersed in a hydro-
philic solvent such as water or buffer solution. Liposomes were rst observed
while being studied as model biological membranes [1]. The aqueous central
compartment of liposomes and spaces between successive bilayers may entrap
hydrophilic agents, whereas phospholipid bilayers may entrap hydrophobic
agents or be the site to which polymers, ligands, or macromolecules are attached
for drug targeting [2]. Entrapment in liposomes can protect the entrapped mate-
rial from metabolic degradation or rapid clearance and provide a controlled ...
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