Food Tests Flashcards
1
Q
How does the iodine test work?
A
Ad a couple of drops of iodine
BROWN -> DARK BLUE/BLACK
2
Q
What is the test for reducing sugars?
A
Benedictus test
3
Q
How does the Benedictus test work?
A
Place sample in water
Ad drops of Benedictus solution
Heat to near boiling point
BLUE->COLOURED PRECIPITATE
(Green/yellow/orange/brick red)
4
Q
What is the test for Protein?
A
Biuret test?
5
Q
How does the biuret test work?
A
Place sample in water
Add equal volume of biuret A (sodium hydroxide/potassium)
Add a few drops of biuret B (copper sulphate)
BLUE->LILAC
6
Q
What is the test for lipids?
A
The emulsion test
7
Q
How doesn’t he emulsion test work?
A
Add a few drops of the sample to test tubeAdd ethanol
Add identical amount of distiller water
COLOURLESS->WHITE LAYER
8
Q
What is the test for vitamin C?
A
DCPIP
9
Q
How do you perform the DCPIP test?
A
Add DCPIP to sample
BLUE -> COLOURLESS
10
Q
What is the test for starch?
A
Iodine
