Proteins

Aim: To test if a sample of food contains protein

Equipment: Test tube, sodium hydroxide (NaOH), copper sulfate (CuSO 4), Food sample.

Method:

1. Place about 2ml 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 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

Conclusion: The one with milk turned into a purplish colour and the one with egg stayed blue