Food tests

• sugar

  -mix the food and Benedict solution, place in water bath at 60-70 degrees for 5 minutes

  -light blue to red
• starch


  -mix the food and iodine in test tube

  -brown to blue-black
• protein


  -mix the food and biuret regent (sodium hydroxide + copper sulphate)

  -light blue to lilac/purple
• lipids


  -add an equal amount of distilled water and ethanol to a test tube with the food

  -white emulsion will form on the surface