Food Testing

Question 1

Name of sugar test (sbs)

Answer 1

Benedict’s solution

Question 2

Name of protein test (pbt)

Answer 2

Biuret test

Question 3

Name of lipids/fats test (lfet)

Answer 3

Emulsion test

Question 4

How to conduct emulsion test (step-by-step)

Answer 4

• Shake the substance with ethanol until it dissolves
• Then pour the solution in water
• If lipids/fats are present, they will precipitate from the solution and form a milky liquid

Question 5

How to conduct biuret test (step-by-step)

Answer 5

• Add potassium hydroxide to the solution to make it alkaline
• Then add copper sulfate solution
• If the solution turns blue, protein is not present
• If the solution turns purple, protein is present

Question 6

How to conduct Benedict’s solution test (step-by-step)

Answer 6

• Add Benedict’s solution to a sample
• Heat it in a water bath that’s set to 75 degrees celcius
• If sugar is present the sample will form a coloured precipitate
• The higher the concentration of sugar, the more the colour changes

Question 7

Benedict’s solution colour chart

Answer 7

Blue (no sugar) -> green -> yellow -> orange -> red (very high concentration of sugar)