Food Tests

Question 1

Protein

Answer 1

Biuret reagent is used to test protein.

Blue Biuret reagent turns purple if a protein is present.

Question 2

Fats/lipids

Answer 2

Ethanol is used to test fats/lipids

Ethanol added to a solution gives a cloudy white layer if
a lipid is present.

Question 3

Sugar

Answer 3

Benedict’s solution is used to test sugar

Blue Benedict’s solution turns brick red on heating if a
sugar such as glucose is present.

Question 4

Starch

Answer 4

Iodine is used to test starch

Yellow–red iodine solution turns blue–black if starch is
present.