The sn-1 and sn-2 positions of the glycerol backbone are esterified with fatty acids of varying length and degree of saturation (illustrated in the symbolic presentations of phospholipids by yellow sticks). Phospholipids are amphiphilic, which means they "love" both water and fat, and consist of a hydrophilic as well as a lipophilic moiety. In addition, they are involved in several cellular processes and used as excipient in various pharmaceutical formulations. Arranged as a lipid bilayer, phospholipids play a significant role in the structure and functionality of biological membranes. They are of natural occurrence and the main components in cellular membranes. Phospholipids are unique and versatile molecules.
In this article, we give an answer to the question "What are phospholipids?" and explain the various phospholipid types. There are different types of phospholipids.
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