Food Tests

Question 1

What is the benedict test for?

Answer 1

Reducing sugars

Question 2

Benedict Test

Answer 2

-Add 5cm^3 of sample into test tube
-Add 10 drops of Benedict solution
-Add to 75 degree water bath for 5 mins

Question 3

Benedict Results

Answer 3

No reducing sugars: Blue
Reducing sugars: Green, Yellow, Red

Question 4

What does the iodine test?

Answer 4

Carbohydrates/Starch

Question 5

Iodine Test

Answer 5

-Add 5cm^3 of sample into test tube
-Add iodine solution (turns brown)
-Shake test tube gently

Question 6

Iodine Test Results

Answer 6

No starch: Brown/Orange
Starch: Blue/Black

Question 7

What does the buiret test do?

Answer 7

Tests for proteins

Question 8

Buiret Test

Answer 8

-Add 2cm^3 of sample into test tube
-Add 2cm^3 of buiret solution (turns blue)
-Gently shake

(potassium hydroxide + copper sulphate)

Question 9

Buiret Test Results

Answer 9

No protein: Blue
Protein: Purple

Question 10

What does emulsion test do?

Answer 10

Tests for lipids

Question 11

Emulsion test

Answer 11

-Add 2cm^3 of sample to test tube
-Add 2cm^3 of ethanol
-Add 2cm^3 of distilled water
-Shake

Question 12

Emulsion Test Results

Answer 12

No lipids: Clear
Lipids: Cloudy White