Lipids with glycerol backbone esterified with one or two fatty acids in position
\(\ce{C-1}\) and/or
\(\ce{C-2}\) and with phosphoric acid at position
\(\ce{C-3}\). The phosphate group is usually esterified with an alcohol (choline, ethanolamine, serine, inositol, glycerol) to form the "lipid head group".
Note: GPs are ubiquitous in nature and are key components of the membrane lipid bilayers of cells.
Examples: Phosphatidyl choline, phosphatidyl ethanolamine, plasmalogens.
Source:
PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1177 (https://doi.org/10.1515/pac-2016-1120)