Lipids

• Fatty acids are made up of...

  hydrocarbon chain that is attached to a carboxyl group
• Contrast: structure of triglyceride and phospholipid

  • Triglycerides contain 3 fatty acids and Phospholipids contain 2 fatty acids
  • Phospholipids contain 1 phosphate group and triglycerides do not
  • Triglycerides are entirely hydrophobic while phospholipids are amphiphillic
• Biochemical test: presence of triglycerides


  1. Grind food
  2. Shake with ethanol and pour solution into water
  3. Milky emulsion means lipid is present