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A Liposome Described In Details

By Anna Hernandez


A liposome is an artificial vesicle comprised of a double layer of lipids. It can be used as vehicles that are usually utilized for administering nutrients and also pharmaceutical drugs to the body of humans. They may be prepared by disrupting a number of biological membranes that may involve sonication.

Liposomes are typically made of natural phospholipids. Besides, they may also be made of a combination of lipid chains bearing somewhat a high degree of surfactant features. These lipid chains might contain egg phosphatidylethanolamine. Their model may take the shape of surface ligands which are used for linking the tissues which are unhealthy.

There are quite different categories of these synthetic lipid laden vesicles. The major types of liposomes are multilamellar vesicle that is shortened as MLV, small unilamellar vesicle that is abbreviated as SUV, large one lamellar vesicle whose short form is LUV, and lastly the cochleate vesicle. This depends on their number of lamella.

These products can easily be confused with micelles and reverse micelles. This might occur because they are nearly similar in structure. Their only difference is that liposomes have a double layer of lipids whereas micelles as well as reverse micelles are made of single layers of lipids.

The membranes of the structures are usually made of phospholipids, which allude to the molecules with head groups as well as tail groups. Their heads are typically attracted to water. Nevertheless, the tail is only made of long chains of hydrocarbons hence are usually resisted by water.

Their hydrophilic heads do make up the outermost layers while their hydrophobic tails make up the inner layers. This is because their heads are attracted to water while their tails are resisted by water. However, in every cell, a layer of heads always faces outside, and gets attracted to the polarized environment. Other layer of heads faces inside cell, and gets attracted to water molecules found within the cell. However, hydrophobic tails of its outer layer face hydrophobic tails of inner layers, thus forming a dual layer structure.

Liposomes were designated by a British hematologist known as Dr. Alec Bangham in 1961 in the institution of Babraham at Cambridge. It was later published in the year 1964. They were clearly found to take after plasmalemma. This was evidenced by pictures that were formed by a microscope that Bangham had used.

They encapsulate an aqueous solution using a hydrophobic membrane. Chemicals which are insoluble in water easily pass across their membranes whereas the ones soluble in water do not. Nonetheless, dissolved hydrophilic particles are able to go through hydrophilic heads. As a result, it may be utilized in releasing hydrophobic and hydrophilic particles. It releases its constituents by adhering to other organelles with similar bilayer walls for instance cell membranes.

These vesicles are utilized in drug and gene delivery services. The drugs and DNA to be conveyed usually contain pH that is appropriate for the roles of any liposome. Its application in DNA transformation is referred to as lipofection. Besides, it can as well be used in delivering dyes to textiles, pesticides to plants, enzymes and nutritional boosters to foods as well as and also cosmetics to skin.




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