Practical 4 - Food tests

Question 1

Solution used for testing sugars

Answer 1

Benedict’s solution

Question 2

Solution used for testing lipids

Answer 2

Sudan III solution

Question 3

Solutions used to test for proteins

Answer 3

Buiret solution

Question 4

Solution used to test for starch

Answer 4

Iodine

Question 5

Positive test for lipids

Answer 5

If a red-stained oil layer appears on top, fat is present

Question 7

Positive test for starch

Answer 7

If blue or blue-black, there is starch present

Question 7

Positive test for proteins

Answer 7

Solution turns pink or purple

Question 8

Positive test for sugar

Answer 8

If the colour is green, yellow or brick red, there are sugars present