Required Practicals - Food tests Flashcards
What does Benedict’s solution test for?
Sugars
What does the iodine test test for?
Starch
What do we use to test for lipids?
ethanol
What do we use to test for protein?
biuret solution
What is the apparatus for Benedict’s test for sugars?
-food sample
-test tube
-Benedict’s solution
-traditional water bath
-thermometer
-pipettes
What is the method for Benedict’s test for sugars?
-set up a water bath using a Bunsen burner
-put some of the food sample into a test tube
-add a few drops of Benedict’s solution to the sample in the test tube
-put the test tube at a minimum 80 degrees C for about 5 mins
-Note down a colour change.
What colour does Benedict’s solution turn in the presence of sugar?
Blue to yellow/orange
What is the apparatus for the Iodine test for Starch?
-food sample
-test tube
-iodine solution
-pipettes
What is the method for the iodine test for starch?
-put some of the food sample into a test tube
-add a few drops of Iodine solution
-note down any colour changes
What colour does Iodine turn starch?
It turns the starch blue/black
What is the apparatus for the Biuret’s solution test for protein?
-a test tube
-10cm3 measuring cylinder
-Biuret solution
What is the method for the Biuret’s solution test for protein?
-put some food sample into a test tube
-add 1cm3 of Biuret’s solution
-shake the tube gently
-note any colour change
What colour does protein turn to in the presence of Biuret’s solution?
It goes from blue to violet
