Food Tests

Question 1

What does the Biuret Test test for?

Answer 1

Test for protein.

Question 2

What does the Iodine Test test for?

Answer 2

Test for starch.

Question 3

What does the Benedict’s Test test for?

Answer 3

Test for glucose.

Question 4

Describe the test for Starch.

Answer 4

Iodine test.
Add iodine to food sample.
Colour change: orange to blue/black.

Question 5

Describe the test for Protein.

Answer 5

Biuret test.
Add potassium hydroxide solution to solution of food.
Add 2 drops of copper sulfate solution.
Colour change: blue to purple

Question 6

What does the Emulsification Test test for?

Answer 6

Test for lipids/fats.

Question 7

Describe the test for lipids/fats.

Answer 7

Emulsification test.
Dissolve a small sample of lipid in ethanol.
Add solution to solution of food in a test tube 3/4 full of cold water.
White cloudy layer forms on top of the water.

Question 8

Describe the test for Glucose.

Answer 8

Benedict’s test.
Add Benedict’s solution to solution of the food.
Put in boiling water bath for 5 mins.
Colour change: blue to brick red

Green- a little
Orange- medium amount
Red- large amount