Food Tests Flashcards
Bendedict’s test is the test for what?
Sugar
What is colour of the chemical at the start of the Biuret test?
(Pale) Blue
What is the Iodine test used for?
To find the presence of Starch in food
Which test has a positive result colour of brick red?
Benedict’s
Does the Biuret test require heat?
No
- Cut food into very small pieces
- Place in a boiling tube
- Add 3cm/3 Ethanol
- Shake and let settle
- 1/2 fill and 2nd test tube with water
- Add drops of Solution 1 to the water
What test is this?
The Emulsion test
Violet is the positive result of what test?
Biuret
How do you carry out the iodine test?
Add several drops of iodine to a solid food or liquid
Copper sulphate is used in what test?
Biuret
Which test requires heat to carry out?
Benedict’s
What is the alternative test for fat?
The paper spot test
What is the colour change for the iodine test if the result is positive?
yellow/orange to blue/black
- Dissolve food in ____ using pestle and mortar
- Add to _______
- Add ____ of _________ solution
- _______ in a _________ for ___ to ___ minutes
This is the method for the Benedict’s test, fill in the blanks
Water, Boiling tube, 2cm/3, Benedict’s, Place, Water bath, 2, 3
What is the positive result of the Emulsion test
Water will become cloudy
What are the steps for the test for protein?
- Dissolve food in 1cm of water using pestle and mortar
- Add to boiling tube
- Add 1cm/3 of dilute sodium hydroxide
- Add 3 drops of copper sulphate
- Shake and watch
