Method:
1. Place about 2 ml of the sample into a test tube and add 5 drops of sodium hydroxide
2. Add 5 drops of copper sulfate.
3. Shake the test tube gently for side to side
Results: If the solution remains blue then there is no protein. If the solution changes to a purple colour then protein is present
Discussion: We dropped 5 drops of copper sulfate onto our food sample( egg white ). We shook gently it and heated it. We saw how both of the two samples turned into a lighter purple colour. This occurred because we know that both of the milk and the egg white contains protein.
Conclusion: The milk and the egg white contains protein











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