Question

how will you test starch, protein and fat in your food​

Answer 1

heya here is your answer

$\large \mathfrak \pink{ \to \: for \: starch}$

$\underline \red{we \: need \: }$

Food samples, water, dillute iodine solution, a test tube.

$\underline \red{what \: we \: need \: to \: do}$

• Take the mashed/liquid food sample in a test tube.

• Add some water to the test tube and shake well to form a solution while covering the mouth of the test tube with the thumb.

• Add a few drops of the yellowish-brown iodine solution

Observe the colour change

$\underline \red{results}$

colour changes to to bluish-black in the presence of starch containing food sample.

$\large \mathfrak \pink{ \to \: for \: fat}$

$\underline \red{ we \: need}$

Food samples, water, filter paper, and a hammer.

$\underline \red{what \: we \: need \: to \: do}$

•Take the a small amount of mashed/liquid food samples and rub it on the filter paper.

•If the food is a hard solid, place it between the sheets of the filter paper and crush with a hammer.

$\underline \red{ result}$

The appearance of the oil stain confirms the presence of fat in the food sample.

$\mathfrak \pink{ \to \: for \: protein}$

$\underline \red{ what \: we \: need}$

Food samples, water, copper sulphate solution, sodium hydroxide solution, Bunsen burner, test tube holder.

$\underline \red{what \: we \: need \: to \: do}$

•Take the mashed/liquid food sample in a test tube.

• Add some water and shake it to form a solution while covering the mouth of the test tube with thumb.

•Heat the testbtube over Bunsen burner for over a minute. Let the test tube cool down.

•Add two drops of each copper sulphate solution and sodium hydroxide solution.

$\underline \red{result}$

The change of colour of the solution to purple or violet confirms the presence of protein in the food sample.

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