Question

if you are supplied with sample of food how will youb perform tests for the presence of starch and protiens in it

Answer 1

Test to show the presence of starch in a food-search in this website-www.biologydiscussion.com>experiments.
Test to show the presence of protein in a food-
https://www.thoughtco.com>test for protein.
I HOPE THIS WILL HELP YOU.

Answer 2

Test for starch

• Take the food sample. put it into a test tube containing water and boil to make a solution.
• Cool the solution and add 2-3 drops of dilute iodine solution to it.
• Blue-black colour of the solution indicates the presence of starch in the food item.

Test for proteins

• Take a small quantity of the food item to be tested. 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.

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