Lipids
- Created by: GeorgiëLizzy
- Created on: 27-11-13 14:56
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- Lipids
- Features
- Contain carbon, hydrogen, and oxygen
- Non polar, insoluble in water
- Dissolve easily in organic solvents eg alcohol
- Fats and oils are types of lipids
- Fats are solid at room temperature
- Oils are liquid at room temperature
- Triglycerides
- made of 3 fatty acids and 1 glycerol
- Glycerol has 3 hydroxyl (-OH) groups
- Fatty acids made of carboxylic group an a hydrocarbon chain varying in length
- Saturated means there are no double bonds in the hydrocarbon chain
- Unsaturated means there are one or more double bonds in the hydrocarbon chain
- Formed by a condensation reaction- 3 water molecules synthesised. Ester bond created
- Not classed as polymers because polymers are made of long chains of the same monomer.
- Roles
- Energy storage
- Heat
- Protection; found around organs to cushion impact
- Electrical insulation, in the myelin sheath of nerve cells
- made of 3 fatty acids and 1 glycerol
- Phospholipids
- Made of 1 glycerol, 2 fatty acids, and 1 phosphate group
- Glycerol and phosphate create hydrophilic head and fatty acids form hydrophobic tail
- Hydrophilic = Water Loving
- Hydrophobic = Water hating
- Glycerol and phosphate create hydrophilic head and fatty acids form hydrophobic tail
- Form the major part of all biological membranes
- In water, these form a bilayer where the tails point inwards away from the water and the heads point out into the water
- Made of 1 glycerol, 2 fatty acids, and 1 phosphate group
- Lipids test
- - Add Ethanol to the same to be tested. Shake thoroughly until sample has dissolved. Add water and shake gently.
- If the solution turns milky white, a lipid is present
- - Add Ethanol to the same to be tested. Shake thoroughly until sample has dissolved. Add water and shake gently.
- Features
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