|biochem Systematic name: phosphatidylcholine any of a group of phospholipids that are found in many plant and animal tissues, esp egg yolk: used in making candles, cosmetics, and inks, and as an emulsifier and stabilizer in foods (E322)|
|[C19: from Greek lekithos egg yolk]|
|Symbol: Pt; atomic weight: 195.09; atomic number: 78|
|Symbol: Ca; atomic weight: 40.08; atomic number: 20|
lecithin lec·i·thin (lěs'ə-thĭn)
Any of a group of phospholipids that on hydrolysis yield two fatty acid molecules and a molecule each of glycerophosphoric acid and choline. They are found in nervous tissue, especially myelin sheaths and egg yolk, and in the plasma membrane of plant and animal cells.
|lecithin (lěs'ə-thĭn) Pronunciation Key
A fatty substance present in most plant and animal tissues that is an important structural part of cell membranes, particularly in nervous tissue. It consists of a mixture of diglycerides of fatty acids (especially linoleic, palmitic, stearic, and oleic acid) linked to a phosphoric acid ester. Lecithin is used commercially in foods, cosmetics, paints, and plastics for its ability to form emulsions.