Test for protein

• equipment

  • A test tube
  • A 10cm° measuring cylinder
  • Biuret solution
• Step 1

  Add a few drops of Bluret's reagent sodium hydroxide and copper (i) sulphate) to the food

  sample in a test tube.
• Step 2

  1. Shake the solution to mix and wait for a few minutes.
• Step 3

  1. If protein is present, the solution turns from blue to purple.
• risks


  copper sulphate is poisonous
• •  and sodium hydroxide (corrosive).
  •  . Wash immediately if comes into contact with skin and wipe away any spills to surfaces.