food tests Flashcards
1
Q
what is the test for a reducing sugar? what is the positive result?
A
- add a few drops of benedicts reagent with heat
blue- brick red
2
Q
what is the test for a non-reducing sugar? what is the positive result?
A
- hydrolyse with HCL, neutralise then add a few drops of benedicts reagent with heat
blue - brick red
3
Q
what is the test for starch? what is the positive result?
A
add a few drops of iodine solution
orange/brown - blue/black
4
Q
what is the test for protein? what is the positive result?
A
add a few drops of biuret solution
blue to purple
5
Q
what is the test for lipids? what is the positive result?
A
(emulsion test)
ad ethanol and an equal volume of water and shake
turns cloudy
