Biuret test

• What is the biuret test used for?

  To test for proteins.
• Firstly, a sample of the solution is placed in a test tube and subsequently an equal amount of NaOH is added.
• Afterwards, a few drops of dilute copper (II) sulfate solution is added and gently mixed
• In the presence

  of a protein, the solution turns lilac/ as an indicator of peptide bonds. In the absence of protein, the solution remains blue.