Biuret Test And Proteins - 2018 - Science

Aim: To test if a sample of food contains protein.

Equipment: Test type, sodium hydroxy (NaOH), copper sulfate (CuSO4) & food sample.

Method:

1. Place 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: The pictures above. Milk ( The photo on the right ) & Egg ( The photo on the left ).

Conclusion:

Egg & Milk: The color of the egg and milk went from white to light blue and then to purple designating that protein was present along with the molecules changing color due to molecules blending together. Additionally, both milk and eggs became purple to indicate a good source of protein.