food tests Flashcards
1
Q
What is the test to detect sugars?
A
Benedict’s test
2
Q
What is Benedict’s test for?
A
sugars
3
Q
How do you do the Benedict’s test?
A
- Add Benedict’s solution to food
- Heat in water bath
- Hazard: Benedict’s solution is an irritant
4
Q
What is the colour change for Benedict’s test?
A
Blue to brick red
5
Q
What is the test for starch?
A
Iodine test
6
Q
What is the iodine test for?
A
Starch
7
Q
How do you do the iodine test?
A
- Add iodine solution to the food
- Hazard: iodine solution is an irritant
8
Q
What is the colour change for Iodine test?
A
Brown to blue
9
Q
What is the test for proteins?
A
Biuret test
10
Q
What is the Biuret test for?
A
Proteins
11
Q
How do you do the Biuret test?
A
- Put food sample in test tube with some water
- Add Biuret solution and shake
12
Q
What is the colour change for Biuret test?
A
Blue to purple
13
Q
What is the test for lipids?
A
Sudan III test
14
Q
What is the Sudan III test for?
A
lipids
15
Q
How do you do the Sudan III test?
A
- Add equal amounts of food and water
- Add drops of Sudan III
- shake
