Food tests

Question 1

What test do we use for Glucose?

Answer 1

Benedict’s test

Question 2

What type of molecule is glucose?

Answer 2

Carbohydrate

Question 3

How is the Benedict’s test used to test for glucose?

Answer 3

Prepare a food sample in a test tube then add Benedict’s solution. Add the tube to a warm water bath for 5 minutes. If sample contains glucose, solution will turn from blue to green/yellow in low concentrations or red in high concentrations

Question 4

What solution do we use to test for starch?

Answer 4

Iodine

Question 5

What type of molecule is starch?

Answer 5

A complex carbohydrate

Question 6

How is iodine used to test for starch?

Answer 6

Add a food sample to a test tube then add iodine and gently shake. If sample contains starch it will turn from browny-orange to black/blue

Question 7

How do we test for proteins?

Answer 7

Using the Biuret test

Question 8

How is the Biuret test used to test for protein?

Answer 8

Prepare a food sample in a test tube then add Biuret solution to the sample and gently shake to mix the contents. If it contains protein it will turn from blue to pink/purple

Question 9

What solution do we use to test for lipids?

Answer 9

The Sudan III stain solution

Question 10

How is the Sudan III stain solution used to test for lipids?

Answer 10

Prepare a food sample in a test tube and add a few drops of the Sudan III stain solution and gently shake to mix. If the sample contains lipids then the mixture will separate to 2 layers - the top layer will be bright red