Lipids
- Created by: Sophie Gibbons
- Created on: 07-01-13 09:31
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- Lipids
- Insolube in water
- Soluble in organic substances
- Roles
- An energy source.
- Waterproofing
- Insoluble in water.
- Insulation.
- Slow conductors of heat.
- Protection.
- Triglycerides
- Tree fatty acids combined with a glycerol molecule.
- Formed in condensation reaction.
- Glycerol molecule is the same, differences come from the fatty acids.
- Saurated - NO double bonds between carbon atoms.
- Mono-unsaturated - ONE double bond between carbon atoms.
- Poly-unsaturated - More than one double bonds between carbon atoms.
- Phospholipids
- One fatty acid is removed and a phosphate molecule added.
- Polar - molecule which have two ends which behave differently.
- Hydrophobic tail - repels water.
- Hydrophilic head - attracts water.
- Test for lipids
- Emulsion test.
- Add 2cm3 of sample, add 5cm3 of ethanol, shake, add 5cm3 of water, shake, cloudy white precipitate shows presence of lipids.
- Emulsion test.
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