Food Tests

• Food tests

  1. Prepare food sample

  2. Crush food with mortar and pestle

  3. Dissolve in distilled water

  4. Filter solution
• What are the 2 Types of sugars

  • Reducing sugars
  • Non-reducing sugars
• Benedict's test for reducing sugars

  1. Prepare food sample

  2. Transfer 5 cm3 to test tube

  3. Heat in 75°C water bath for 5 minutes

  4. Add Benedict's solution
• Benedict's test

  • Tests for reducing sugars
  • Solution turns green, yellow or brick red if reducing sugars present
• Iodine test for starch

  1. Take 5 cm3 of food sample

  2. Add iodine solution

  3. Solution turns blue-black if starch present
• Buriet test for proteins

  1. Take 2 cm3 of food sample

  2. Add 2 cm3 of Buriet solution

  3. Solution turns pink or purple if proteins present
• Sudan III test for lipids

  1. Take 5 cm3 of food sample

  2. Add 3 drops of Sudan III stain

  3. Red oil stained layer forms at top if lipids present