What are liposomes simple definition?
Liposomes are small artificial vesicles of spherical shape that can be created from cholesterol and natural non-toxic phospholipids. Due to their size and hydrophobic and hydrophilic character(besides biocompatibility), liposomes are promising systems for drug delivery.
What is a liposome and its function?
A liposome is a spherical vesicle having at least one lipid bilayer. The liposome can be used as a drug delivery vehicle for administration of nutrients and pharmaceutical drugs, such as lipid nanoparticles in mRNA vaccines, and DNA vaccines.
What kind of drugs may be delivered by a liposome?
Doxorubicin (Doxil) and Daunorubicin (anticancer drugs) may be given via liposomes. Liposomes is used in cancer therapy, since cancer cells have overexpressed folate and transferrin receptors, making transferrin and folic acid as suitable ligands [32].
What is the difference between liposome and micelle?
Liposomes are composed of a lipid bilayer separating an aqueous internal compartment from the bulk aqueous phase. Micelles are closed lipid monolayers with a fatty acid core and polar surface, or polar core with fatty acids on the surface (inverted micelle).
What is liposomal made of?
Liposomes are spherical vesicles made up of biodegradable natural or synthetic phospholipids. They usually have one or more concentric membranes. Liposomes are composed of phospholipids, which are amphipathic and are characterized by having a lipophilic tail and hydrophilic head on the same molecule (Lasic, 1993).
What is liposome structure?
A liposome is a spherical-shaped vesicle that is composed of one or more phospholipid bilayers, which closely resembles the structure of cell membranes. The ability of liposomes to encapsulate hydrophilic or lipophilic drugs have allowed these vesicles to become useful drug delivery systems.
Is liposome a nanoparticle?
Liposomes are a type of clinically well-established nanoparticle that have been commercially used to deliver cytotoxic drugs, antifungal drugs and vaccines. Some of the approved commercial liposome-based products are shown in Table 1.
How is drug release from liposome?
When liposomes are exposed to 808 nm irradiation the liposomal membranes rupture releasing the drug. For all concentrations of drug tested against 4T1 cells in vitro, irradiated liposomes lead to significantly higher cell death compared to non-irradiated liposomes.
What is micelle and bilayer?
The micelle interior is completely nonpolar. Spherical bilayers that enclose an aqueous compartment are called vesicles or liposomes. Micelles and bilayers, formed from single and double-chain amphiphiles, respectively, represent noncovalent aggregates and hence are formed by an entirely physical process.
What is the difference between micelles and chylomicrons?
The key difference between micelles and chylomicrons is that micelles are globules of lipid molecules that are arranged in a spherical form in an aqueous solution while chylomicrons are lipoproteins that consist of a core made from triglycerides and cholesterols and a coat made from phospholipids and apolipoproteins.
What is the benefit of liposomal?
Liposomes are designed not only to protect the nutritional supplement from degrading and absorbing in the harsh environment of the gut terrain, but also to deliver the nutrients in a targeted manner to specific tissues and areas of the body.
What are the main components of a liposomes?
Phospholipids are the main component of liposomes, which are amphiphilic molecules with hydrophobic tail and hydrophilic head group. The head groups of phospholipids are hydrophilic, while their fatty acid tails are usually acyl chains and hydrophobic.
What is liposomal formulation?
A liposome drug formulation is different from (1) an emulsion, which is a dispersed system of oil in water, or water in oil phases containing one or more surfactants, (2) a microemulsion, which is a thermodynamically stable two phase system containing oil or lipid, water and surfactants, and (3) a drug-lipid complex.