The difference between them is in their hydrocarbon chains
Saturated Fatty Acids
- Only single bonds between the carbon atoms in the hydrocarbon chain. Every bond has a hydrogen attached, so the lipid is saturated with hydrogen
- They have high melting points and are therefore solid at room temperature e.g. animal fats
- A high intake of saturated fats is a contributory factor in heart disease
Unsaturated Fatty Acids
- Have one or more double bonds in their hydrocarbon chain
- This gives the molecule a kink and they tend not to pack together well - giving an unsaturated fat a more open and therefore oily nature
- They have low melting points,so are liquid at room temperature e.g. plant oils
Three fatty acids bond with a glycerol molecule to form a triglyceride. There are three condensation reactions which occur, releasing 3 water molecules and forming three ester bonds. Triglycerides are non-polar so they do not attract water, therefore they are hydrophobic molecules
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