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1.6

Minor Versionm

by Procheta Mallik

Introduction

This is just a set of variations for the tactivity, see the Food Test - Protein for more information.

Video Overview

    • Sodium Hydroxide (NaOH) is a highly reactive and caustic substance. Handle the flakes and solution with extreme care and caution.

    • Extended skin contact with NaOH can lead to ulceration and scarring.

    • Add water to NaOH flakes; not NaOH flakes to water. For every gram of flakes add a minimum of 10ml of water.

    • Add copper sulphate solution drop by drop.

    • Handle the breakable material carefully.

    • Please do not ingest any of the materials.

  1. Variation 1 : Hot milk. Variation 2 : Guava.
    • Variation 1 : Hot milk.

    • Variation 2 : Guava.

    • Variation 3 : Potassium hydroxide.

    • Variation 4: Calcium hydroxide.

  2. Take a test tube, add milk and heat it until first boil using a test tube holder. Add 3 ml  of NaOH followed by the usual 5-6 drops of CuSO4 and shake well. Resultant sample colour should change to brown after a couple of minutes.
    • Take a test tube, add milk and heat it until first boil using a test tube holder.

    • Add 3 ml of NaOH followed by the usual 5-6 drops of CuSO4 and shake well.

    • Resultant sample colour should change to brown after a couple of minutes.

  3. Take raw and ripe guava paste. Add 2 grams of paste in the respective test tubes and add around 2ml water to make it a liquid-ish mixture. Repeat the protein test for it  and compare the results of the samples. Repeat the protein test for it  and compare the results of the samples.
    • Take raw and ripe guava paste. Add 2 grams of paste in the respective test tubes and add around 2ml water to make it a liquid-ish mixture.

    • Repeat the protein test for it and compare the results of the samples.

  4. Take  KOH (0.5g)  in a small container, preferably a closed container/bottle with small opening. Fill the container with water, close it, and shake well to dissolve the flakes. You will have KOH solution in the bottle. Take 2ml of milk in a test tube.  Add equal amount of KOH followed by CuSO4 drop-by-drop and shake well. Take 2ml of milk in a test tube.  Add equal amount of KOH followed by CuSO4 drop-by-drop and shake well.
    • Take KOH (0.5g) in a small container, preferably a closed container/bottle with small opening. Fill the container with water, close it, and shake well to dissolve the flakes. You will have KOH solution in the bottle.

    • Take 2ml of milk in a test tube. Add equal amount of KOH followed by CuSO4 drop-by-drop and shake well.

  5. Take a  test tube and add a small amount (1 g) of calcium oxide (lime) and 1 ml of milk to it. Now add 5  drops of water inside the test tube and dampen the litmus paper in water. Carefully heat the test tube on a flame. Hold the damp litmus paper over the mouth of the test tube and observe any colour change.
    • Take a test tube and add a small amount (1 g) of calcium oxide (lime) and 1 ml of milk to it.

    • Now add 5 drops of water inside the test tube and dampen the litmus paper in water.

    • Carefully heat the test tube on a flame. Hold the damp litmus paper over the mouth of the test tube and observe any colour change.

    • If the protein is present in food (positive test for protein), the litmus paper will change colour from red to blue. .

    • If protein is not present in food (negative test for protein), the litmus paper will not turn blue.

Finish Line

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