A limited amount of dietary lipid occurs as PL. PL are distinct from TG in that they contain polar head groups that confer amphipathic properties to the molecule. PL are insoluble amphophiles with a hydrophilic, often zwitterionic, head group, and hydrophobic tails composed of two longer-chain FA. These head groups are attached to the primary glycerol moiety via phosphate linkages. Polar head groups can vary in size and charge and include inositol, choline, serine, ethanolamine, and glycerol.
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