Food Tests

• How to test for sugars?

  • Benedicts solution - MUST HEAT IN WATER BATH
• How to test for proteins

  • Biuret's reagent
  • P - lilac
  • N - blue
• What is the test for starch?


  • Iodine solution
  • Drip onto food
  • P - Blue black
  • N - Reddy orange
• Test for fats 


  • add the food into a tube of water
  • add drops of sudan III
  • positive then a red layer forms on the surface