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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.
Lipids consist of a glycerol molecule linked with at least one and a maximum of three fatty acids. Lipids are molecules which contain a glycerol molecule, a carbohydrate, and at least one fatty acid. Glycerol has three OH groups, which allow fatty acids - which have a COOH group - to link to them with a condensation reaction. A condensation reaction is a reaction between an OH group and a COOH group, which links the two molecules together, splitting off a molecule of water: RâCOOH+HOâRâRâCOCâR+H2O.