write the procedure to test proteins
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Using a dropper add two drops of copper sulphate solution to the test tube. Add 10 drops of caustic soda solution and shake the test tube. Observe the colour of the mixture. Violet colour indicates the presence of proteins in the tested food item.
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1.To a test tube, add 40 drops of liquid to be tested.
2. If testing more than one liquid, label each test tube with a marker.
3.Add 3 drops of Biuret reagent solution to each test tube. Shake gently to mix.
4. Note any color change. Proteins will turn solution pink or purple.
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