Testing for Protein - The Biuret Test
Aim: to test if a sample of food contains protein
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 sulphate.
3. shake the test tube.
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: if food sample has protein in it should turn purple is not it will stay blue.
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