Fatty acids (FA) consist of carbon, hydrogen, and oxygen, arranged as a linear carbon chain skeleton of variable length, generally with an even number of atoms, with a carboxyl group at one end. (a) (b) 4. General Features of Fatty Acid Structure Classification of Fatty Acids. Fatty acids are significant in the nutrition of living organisms, because of the cell membrane's integral structure built up of fatty acids. Fatty acid sources "Eicosanoid" (eicosa-, Greek for "twenty"; see icosahedron) is the collective term for straight-chain polyunsaturated fatty acids (PUFAs) of 20 carbon units in length that have been metabolized or otherwise converted to oxygen-containing products.The PUFA precursors to the eicosanoids include: Arachidonic acid (AA), i.e. “D” for Double bonds, Decreased melting temperature and Decreased atherosclerotic risk (by decreasing LDL) Trans-fatty acid: Unsaturated fatty acid which act like saturated fatty acid (hydrogenation of unsaturated fatty acid) C) Lecithin (phosphatidylcholine), which is used as an emulsifier in margarine and chocolate, is a sphingolipid. Chemical Structure: Omega 3 fatty acids: ALA is an essential omega-3 fatty acid that denotes as 18:3Δ9c, 12c, and 15c. They have the general structure CH 3 (CH 2) n COOH. Basic Structure of Fatty Acids. In the space below, draw the structure of a cis-unsaturated fatty acid with 27 carbon chain. While obesity is becoming a large issue in society today, the reviewing of types of fats and how they affect our bodies is a growing concern. At room temperature, butter is a solid while vegetable oil is a liquid. One system of fatty acid classification is based on the number of double bonds. Fatty acids are a class of compounds containing a long hydrocarbon chain and a terminal carboxylate group (-COOH). What are two important trends related to the melting points of fatty acids? Fats can be found in different quantities of various foods. D) Some sphingolipids include oligosaccharides in their structure. 0 double bonds: saturated fatty acids. (hint: use bond line structure) 3. Structure. Saturated fatty acids are compounds that contain a carboxylic acid group with a long hydrocarbon chain consisting of carbon (C) and hydrogen (H) atoms. Omega 6 fatty acids: ω-6 fatty acids, n-6 fatty acids. B) Glycerophospholipids contain fatty acids linked to glycerol through amide bonds. This means a chain of 18 carbons with 3 double bonds on carbons run to 9, 12, and 15. Fatty acids from 2 to 30 carbons or more occur, but the most common and important ones contain between 12 and 22 carbon atoms and are found in many different animal and plant fats. Fatty acids are composed largely of a chain of carbon atoms bonded with hydrogen atoms. Saturated fatty acid: Single bond (“S” for saturated and single bond) Unsaturated fatty acid: Double bond(s), i.e. Omega-3 fatty acids are polyunsaturated fats, a type of fat your body can’t make.. Stearic acid is a typical long chain saturated fatty acid.