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The triesters of fatty acids with glycerol (1,2,3-trihydroxypropane) compose the class of lipids known as fats and oils. These triglycerides (or triacylglycerols) are found in both plants and animals, and compose one of the major food groups of our diet.
Glycerol and Fatty Acids. One major class of lipids is called glycerolipids. Glycerolipids are composed of glycerol and fatty acids. Glycerol, whose structural formula is shown at right, has three carbon atoms, each of which has a hydroxyl (-OH) group bound to it.Fatty acids are fairly long linear hydrocarbon chains with a carboxylic acid group at one end.lycerol, whose structural formula is shown at right, has three carbon atoms, each of which has a hydroxyl (-OH) group bound to it. Fatty acids are fairly long linear hydrocarbon chains with a carboxylic acid group at one end.