food tests Flashcards
1
Q
How do you test starch?
A
You add a few drops of iodine solution.
2
Q
What colour does starch turn?
A
Blue-Black
3
Q
How do you test lipids?
A
You add a few drops of ethanol and shake it. Then you add a small amount of water,
4
Q
What shows that there are lipids?
A
The sample will turn cloudy.
5
Q
How do you test sugar?
A
Add a few drops of Benedict’s solution. Then put it in the bath.
6
Q
What shows there is sugar?
A
The sample will turn orange-red.
7
Q
How do you test protein?
A
Add a few drops of Copper sulfate and a few drops of Sodium hydroxide OR add Biuret’s soultion (which is the same thing).
8
Q
What shows that there is protein?
A
The sample will turn purple
