Lipids

• Lipids make up around 10% of our body mass
• Lipids are deposited under our skin for insulation and around organs such as the heart and kidneys for protection
• Lipids are made up of a glycogen molecule with fatty acid chains attatched
• What are the 2 tests for lipids?

  1. Sudan 3 test
  2. Ethanol test
• What is the Sudan 3 test?

  1. Take 5ml of unfiltered sample
  2. Add 3 drops of Sudan 3 and shake
  3. If lipids are present a red layer will form at the top
• What is the Ethanol test?

  1. Fill half a test tube will ethanol
  2. Add a small amount of lipid and shake well
  3. Fill half a second test tube with distilled water
  4. Pour the top of the ethanol tube into the distilled water tube and shake gently
  5. A positive test will show a cloudy white emulsion