Food Tests

Question 1

What is the food test for Vitamin C?

Answer 1

DCPIP
The colour change blue to colourless

Question 2

Test for Starch

Answer 2

Drops of iodine solution on food sample
Colour change from yellow to blue/black

Question 3

Test for Protein

Answer 3

4 cm^6 of Buiret Solution
Shake for one minute
Colour change from blue to purple

May turn dark blue even if nothing is present, control is suggested

Question 4

Test for Reducing Sugar

Answer 4

2 cm^3 of Benedicts’s solution
Water bath for 3 minutes
colur change from clear blue to brick red

varies from green to red depending on the amount of protein present

Question 5

Test for Fats

Answer 5

Crush up food, add ethan and shake vigourously to dissolve
Pour (decant) into half a test tube of water
if fat is present, white emulsion is formed

The Emulsion test