Food test

• For each test you need

  To break up a piece of food using a pestle and mortar

  Transfer ground up food to a beaker and add some distilled water

  Give mixture a good stir with a glass rod

  Filter solution
• Benedicts test

  Prepare a food sample and transfer 5cm^3 to a test tube

  prepare a water bath at 75 degree celsius

  Add some Benedict's solution to the test tube (10 drops)

  Place test tube into water bath and leave for 5 minutes (Test tube facing away)
• If Sugar is present with benedicts solution it will turn from BLUE to green,yellow or brick red depending on sugar content
• Starch Test: Add iodine solution to food sample. If starch is present, the solution will turn blue-black.
• Biuret Test:

  Prepare food sample and add 2cm^3 to test tube

  Add 2cm^3 of biuret to the test tube and mix by gently shaking
• Biuret's Solution will turn from blue to purple if proteins are present
• Sudan III test

  Prepare a sample of food and transfer 5cm^3 to a test tube

  Use a pipette to add 3 drops of Sudan III and gently shake
• Sudan III forms a separate red layer if lipids are present