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lipid structure Structure and properties of two representative lipids. Both stearic acid (a fatty acid) and phosphatidylcholine (a phospholipid) are composed of chemical groups that form polar “heads” and nonpolar “tails.” The polar heads are hydrophilic, or soluble in water, whereas the nonpolar tails are hydrophobic, or insoluble in ... Essential fatty acids, or EFAs, are fatty acids that humans and other animals must ingest because the body requires them for good health but cannot synthesize them.. The term "essential fatty acid" refers to fatty acids required for biological processes but does not include the fats that only act as fuel. Lauric Acid. Saturated fatty acids are composed of carbon, hydrogen and oxygen atoms. The general formula is shown in the following illustration. Here, the number of hydrogen (H) atoms (2n) is twice the number of the carbon (C) atoms (n) and there are always two oxygen (O) atoms. Most of the bulk of the molecule (as well as the energy contained therein) is in the long hydrocarbon chains called fatty acid chains that are attached to it. As long as an oil or fat has this basic structure, it is a good candidate for being turned into biodiesel. Aug 01, 2017 · The chain length of most common fatty acids is of 16-18 number of carbon. The triglyceride is considered as the common and simple type of fat, having three fatty acids and glyceride. By the chemical structure of fatty acid chain, the division is done.