MSI_000002373

PC(18:2(9Z,12Z)/18:2(9Z,12Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(18:2(9Z,12Z)/18:2(9Z,12Z)), in particular, consists of two chains of linoleic acid at the C-1 and C-2 positions. The linoleic acid moieties are derived from seed oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC. 1-18:2-2-18:2-sn-glycerol-3-phosphocholine, also known as dilinoleoylphosphatidylcholine or L-dilinoleoyllecithin, is a member of the class of compounds known as phosphatidylcholines. Phosphatidylcholines are glycerophosphocholines in which the two free -OH are attached to one fatty acid each through an ester linkage. Thus, 1-18:2-2-18:2-sn-glycerol-3-phosphocholine is considered to be a glycerophosphocholine lipid molecule. 1-18:2-2-18:2-sn-glycerol-3-phosphocholine is practically insoluble (in water) and a moderately acidic compound (based on its pKa). 1-18:2-2-18:2-sn-glycerol-3-phosphocholine can be found in a number of food items such as green bean, malabar spinach, peach, and swede, which makes 1-18:2-2-18:2-sn-glycerol-3-phosphocholine a potential biomarker for the consumption of these food products. 1-18:2-2-18:2-sn-glycerol-3-phosphocholine can be found primarily in blood, saliva, and urine, as well as throughout all human tissues. In humans, 1-18:2-2-18:2-sn-glycerol-3-phosphocholine is involved in a couple of metabolic pathways, which include phosphatidylcholine biosynthesis PC(18:2(9Z,12Z)/18:2(9Z,12Z)) and phosphatidylethanolamine biosynthesis PE(18:2(9Z,12Z)/18:2(9Z,12Z)).