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How do we know that food …

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How do we know that food has protein or not ? Say the expriment method in short ?

    • Posted by Gourisankar Ojha 5 years, 5 months ago

    CBSE > Class 06 > Science (OLD)
    • 1 answers

    Meghna Thapar 5 years, 4 months ago

    Test for protein:

    1. Take 2 ml of the given food-stuff solution in a test tube.
    2. Add a little of dilute sodium hydroxide solution till the mixture clears.
    3. Then add 2 to 3 drops of copper sulphate solution and shake well.
    4. If a violet colour appears in the solution, then protein is present in the given food-stuff.Note: If the food item to be tested is in solid form, then a powder or a paste is made by grinding it and adding few drops of water in a test tube. Afterwards, the test tube is made to shake well to form a solution or suspension.

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