food tests Flashcards
1
Q
What is the test for reducing sugars?
A
Benedict’s test
2
Q
What is the test for starch?
A
Starch-iodide test
3
Q
What is the test for lipids?
A
Ethanol emulsion test
4
Q
What is the test for proteins?
A
Biuret test
5
Q
What is the observation for starch present?
A
Mixture turned from yellowish-orange to blue-black
6
Q
What is the observation for protein present?
A
Mixture turned from blue to violet / lilac
7
Q
What is the observation for large / moderate / low / trace amount of reducing sugars present?
A
Brick-red / orange / yellow / green precipitate was obtained from blue mixture
8
Q
What is the observation for lipid present?
A
A white emulsion was formed when water was added
