Biological Molecules - Food Testing Flashcards
1
Q
Test for starch
A
Add iodine (potassium iodide solution)
2
Q
Result for starch test
A
From brown/orange to blue/black is positive
3
Q
Test for lipids
A
Emulsion test - add ethanol and water
4
Q
Result for lipid test
A
If white emulsion appears, lipids are present
5
Q
Test for reducing sugars
A
The Benedict’s test
6
Q
Result for reducing sugars test
A
Brick-red precipitate = reducing sugars are present
7
Q
Result for non-reducing sugars test
A
Brick-red = non-reducing sugars are present
8
Q
Non-reducing sugars test
A
The Benedict’s test (with HCl and sodium Hydrogen carbonate solution)
9
Q
Test for proteins
A
Bitter test
10
Q
Result for protein test
A
From blue to purple solution = positive test
