A small quantity of powdered food sample is taken in a test tube. few drops of a blue coloured solution were added to it. the mixture was then heated slowly. the blue coloured solution turned orange on heating.1) identify the blue coloured solution 2) Which nutrient is present in the food sample
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BIOLOGY
You have been supplied with a sample of food. How will you perform tests for the presence of starch and proteins in it?
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ANSWER
Test for starch
Take the food sample.
If it is a solid crush it using a mortar and pestle.
Add water and mix it.
Crush the sample until it turns into a semi-liquid state
Add brown iodine soln.
If the liquid on addition turns blue-black there in presence of starch
Test for protien
Take a small quantity of the food items to be tested.
Grind/mash the food item.
Put the food item into a test tube.
Add 10 drops of water and shake the test tube.
Using a dropper add two drops of copper sulphate solution to the test tube.
Add 10 drops of caustic soda solution and shake the test tube.
Observe the colour of the mixture.
Violet colour indicates the presence of proteins in the tested food item.
Answer:
Explanation:
1 the solution is known as soluble.
2 the nutrient is protein.