Question

how you will prepare test of protein explain it​

Answer 1

First, test for milk, which contains casein and other proteins. Once you understand what to expect from the test, you can examine other foods.

1. Add a small amount of calcium oxide and 5 drops of milk to a test tube.
2. Add three drops of water.
3. Dampen the litmus paper with water. Water has a neutral pH, so it should not change the color of the paper. If the paper does change color, start again using distilled water rather than tap water.
4. Carefully heat the test tube in a flame. Hold the damp litmus paper over the mouth of the test tube and observe any color change.
5. If protein is present in a food (positive test for protein), the litmus paper will change color from red to blue. Also, if you smell the test tube, you should be able to detect the odor of ammonia if protein was present. If protein is not present in food or is in insufficient concentration to produce enough ammonia for the test (negative test for protein), the litmus paper will not turn blue.