1:3:2 Investigate food samples using food tests

Question 1

What method would you use to test for simple sugars.

Answer 1

A few drops of Benedict’s is added to Glucose, which is in a boiling tube. The initial colour is blue until it’s heated for five minutes and becomes a brick-red precipitate colour.

Question 2

What method would you use to test for complex carbohydrates.

Answer 2

A few drops of iodine is added to starch in a spotting tile. It’s initial colour is yellow-brown until it mixes with the starch and becomes blue-black.

Question 3

What method would you use to test for protein.

Answer 3

Add a few drops of biuret to the protein in a spotting tile. The original colour was blue and the final colour is purple.

Question 4

What method would you use to test for fats.

Answer 4

Add (2 ml of oil to a boiling tube), add (2 ml of ethanol) to it. Mix them together and (warm the tube with your hands). Then add some water. The initial colour was (clear) and the final colour is (white emulsion).