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Lipids
Lipids
Lipids
Lipids
Lipids
Lipids
Lipids
Lipids
Lipids
Lipids
Lipids
Lipids
Lipids
Lipids
Lipids
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Lipids

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  • 1. AS Biology Core Principles Lipids dr shabeel pn
  • 2. Aims
    • Elements of lipids
    • Structure of glycerol & fatty acids
    • Condensation reactions to form triglycerides
    • Phospholipids
  • 3. Introduction to lipids
  • 4. Introduction to lipids
    • Lipids contain the elements carbon, hydrogen and oxygen.
    • They have numerous functions, primarily energy stores in animals and plants.
    • Lipids consist of two types of molecules - glycerol & fatty acids.
  • 5. Glycerol
    • A molecule of glycerol is made up of three carbon atoms.
    • Each of these has a hydroxyl group attached to it.
    • Hydrogen atoms occupy the remaining positions.
  • 6. Fatty Acids
  • 7. Fatty Acids
    • A single fatty acid molecule contains an acid (COOH) group attached to a hydrocarbon chain.
    • Hydrocarbon usually denoted by the letter ’R’.
    • Saturated = If every carbon atom in the chain is joined by a single C-C bond.
    • Unsaturated = at least one C=C bond.
    • Polyunsaturated = many double bonds.
    • Most animal fats are saturated while most plant fats are unsaturated.
  • 8. Triglycerides
  • 9. Triglycerides
    • A triglyceride molecule is made of a glycerol molecule and three fatty acids.
    • The molecules join together through the process of condensation losing a molecule of water each time a link is made.
    • The link between the glycerol molecule & each fatty acid is an ‘Ester Link’.
    • The fatty acids in a lipid molecule can differ in length and can be saturated or unsaturated.
  • 10. Triglycerides
  • 11. Phospholipids
    • In phospholipids one of the fatty acids of a triglyceride is substituted by a phosphate group.
  • 12. Phospholipids
  • 13. Phospholipids
  • 14. Lipids & water
    • Triglycerides and phospholipids have hydrophobic and hydrophilic groups.
      • What does this mean?
      • To what use is this feature put in biology?
  • 15. More Info
    • To make further notes on Lipids :
      • Pages 11 & 12 in Collins
      • Pages 69 - 71 Roberts
      • www.mrothery.co.uk
      • www.learn.co.uk
      • www.bbc.co.uk/education/asguru/

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