Question

write the procedure to test proteins​

Answer 1

Answer:

What to do.

• To a test tube, add 40 drops of liquid to be tested.

• If testing more than one liquid, label each test tube with a marker.

• Add 3 drops of Biuret reagent solution to each test tube. Shake gently to mix.

• Note any color change. Proteins will turn solution pink or purple.

Explanation:

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Answer 2

Following steps are used to test if a food item contains protein:

1) Take a small quantity of the food items to be tested.

2) Grind/mash the food item.

3) Put the food item into a test tube.

4) Add 10 drops of water and shake the test tube.

5) Add two drops of copper sulphate solution to the test tube, using a dropper.

6) Add 10 drops of caustic soda solution using a dropper and shake the test tube.

7) Let the test tube rest in a test tube stand for a few minutes.

8) Observe the colour of the mixture.

9) Violet colour indicates the presence of proteins in the tested food item.

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