This document summarizes key information about lipids and fats: 1. Lipids are organic compounds that are greasy to touch and insoluble in water but soluble in organic solvents. They contain carbon, hydrogen, oxygen, nitrogen and phosphorus and are a concentrated source of energy. 2. Fats are composed of triglycerides, which are esters of glycerol and fatty acids. Fatty acids are the building blocks of several lipid classes. Unsaturated fatty acids contain one or more double bonds and are important for growth and health. 3. Lipids serve many functions in the body including as an energy source, insulating and protecting tissues, carrying fat-soluble vitamins, and

37. Some metabolically important FA: Animal fats C18H36O2 0 18 octadecanoic Stearic Plants & animal fats C16H32O2 0 16 hexadecanoic Palmitic Coconut,nutmeg C14H28O2 0 14 tetradecanoic Myristic Laurel, coconut oil C12H24O2 0 12 duodecanoic Lauric Occurrence Chemical formula No. of = bonds No. of C atoms Systematic name Common name

38. Lecithin, cephalin, liver, fish C20H32O2 4 20 All cis - 5,8,11,14 eicosatetraenoic Arachidonic Linseed oil C18H30O2 3 18 All-cis-9,12,15 octadecatrienoic Linolenic Linseed oil C18H32O2 2 18 Cis 9 octadecadienoic Linoleic Cottonseed oil C18H34O2 1 18 Cis 9 octadecanoic Oleic Butter, fish, oils, hen fat C16H30O2 1 16 Cis 9 hexadecanoic Palmitoleic