Tests For Starch🍞, Sugar🍪, Protein🧀 And Fat🍩 Flashcards
(20 cards)
What is the starch test called?
the iodine test
What is the method for the starch test (iodine test)?
-add several drops of iodine to food or liquid
What is the result of the starch (iodine) test?
Orange/yellow to blue/black
What does the Benedict’s test test for?
Sugar
What is the proper name for the sugar test?
Benedict’s test
What is the method for the sugar (Benedict’s) test?
- dissolve food in water with pestle and mortar
- add to boiling tube
- add 2cm3 of Benedict’s solution
- place in a water-bath for 2-3 minutes
What is the result for the Benedict’s test (sugar test)
Blue to green to brick red
What is the biuret test testing for?
Protein
What is the proper name for the protein test?
The biuret test
What is the method for the protein test (biuret test)?
- dissolve food in 1cm3 of water using pestle and mortar
- add to boiling tube
- add 1cm3 do dilute sodium hydroxide
- add 3 drops of copper sulphate
- shake and watch
What is the result of the biuret (protein) test?
Starts a pale blue then turns violet
What does the emulsion test test for?
Fat
What is the proper name for the fat test?
The emulsion test
What is the method for the emulsion (fat) test?
- cut pieces of food into very small pieces
- place in a boiling tube
- add 3cm3 of ethanol
- shake and leave to settle
- half fill a 2nd test tube with water
- carefully add drops of the solution from the 1st test tube to the water
What is the result of the emulsion (fat) test?
Water will become very cloudy - especially at the top of the test tube.
What is ANOTHER test for fat called?
The paper spot test
What does the paper spot test test for?
Fat
What is the method for the paper spot (fat) test?
- rub a solid food on a piece of grease-proof paper.
What is the result for the paper spot (fat) test?
The fat will leave a greasy translucent stain on the paper
The iodine test tests for what?
Starch
