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Lipid is the collective name for fats, oils, waxes and fat-like molecules (such as steroids) found in the body. protection, waterproofing, insulation and buoyancy agents. The basic unit of lipids is a triglyceride, synthesised from glycerol (propane-1,2,3-triol) and fatty acids. Glycerol is a type of alcohol. Alcohols are organic compounds. Their molecules are characterised by hydroxyl groups, -OH. Glycerol is a trihydric alcohol, which means each molecule has three hydroxyl groups.
Glycerol is a 3-carbon molecule, which is produced naturally in the body as a result of normal metabolism. Although classed as an alcohol, glycerol plays a number of important roles in the body.For example, phosphoglycerides, which consist of a glycerol backbone bonded to two fatty acid chains and another alcohol, are an important component of cell membranes.lycerol is also used to store fatty acids in the body; in this process, three fatty acid chains are chemically bonded to a glycerol molecule â hence the term â triglyceride â.