Lipids
- Created by: oliviasimmons99
- Created on: 11-06-17 13:45
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- Lipids
- Properties
- Do not mix with water
- Store a lot of energy compared with an equivalent amount of carbohydrateor protein
- Types
- Triglycerides
- Phospholipids
- Triglycerides
- Formed by the condensationof one molecule of glycerol attached to three molecules of fatty acids
- Main energy storage compound in animals
- They contain carbon, hydrogen and oxygen
- Fatty acids
- R group of fatty acids can change: the no. of carbon atoms in the chain and the no. of C=C bonds in the chain
- No C=C bonds, it is saturated
- 1 C=C bond, it is unsaturated
- 2 or more C=C bonds, it is poly-unsatuated
- Phospholipids
- Contain a phosphate-containing group instead of one of the fatty acid molecules
- Contain the elements carbon, hydrogen, oxygen and phosphorus
- Made up of one phosphate, one glyceroland two fatty acids
- The head is hydrophilic (attracted to water) and the tails are hydrophobic (repelled by water)
- In water, they automatically arrange themselves into a double layer, the basis of cell membranes
- Testing for lipids
- Dissolve test substance in ethanol, then filter, add water to filtrate
- Emulsion test
- Positive: cloudy/milky as emulsion has formed. Negative: clear
- Properties
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