Food Tests

Question 1

What does Benedict’s solution test for?

Answer 1

Glucose (simple sugar)

Question 2

What colour is a positive Benedict’s test?

Answer 2

Red (orange means little bit of sugar)

Question 3

What does the Biuret solution test for?

Answer 3

Protein

Question 4

What colour is a positive Biuret test?

Answer 4

purple

Question 5

What is the test for starch?

Answer 5

Iodine

Question 6

What colour is a positive test?

Answer 6

Blue/black

Question 7

What is the ethanol + water test for?

Answer 7

Lipids

Question 8

What is the positive lipid emulsion result?

cl

Answer 8

from colourless to cloudy white liquite

Question 9

Describe how you would prepare a food sample for a food test in 4 steps.

Answer 9

1. Grind the food up using a mortar and pestle
2. Add food to a test tube and add distilled water to it
3. Put a bung in the test tube and invert the test tube to mix the contents
4. Using a funnel and filter paper, pour the liquid out and collect the solid food powder