Equipment: Test tube, sodium hydroxide (NaOH), copper sulfate (CuSO), food sample.
Method:
- Place about 2mL of the sample into a test tube and add 5 drops of sodium, hydroxide.
- Add 5 drops of copper sulfate.
- Shake the test tube gently from side to side.
Results: If the solution remains blue, then no protein is present. If the solution changes to a purple colour then protein is present in the sample
Discussion: The milk didn't turn a different colour, even if we added heat. It remained a blue colour but should have turned to a purple colour. The egg white started blue, turned to a green colour after we shook it and turned to a really light shade of purple once we added heat from the Bunsen burner to it.
Conclusion: The egg white changed to a purple-like colour meaning there was protein present in the sample.
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