Food Tests Flashcards
What are the 4 food tests
Carbohydrates = glucose and starch
Lipids and fats
Proteins
What is the test for glucose
Benedicts test
What is the test for starch
Iodine test
What is the test for lipids/fats
Ethanol test also known as the emulsion test
What is the test for proteins
Biuret reagent
What is the starting colour for glucose and positive test colour
Blue solution of benedicts reagent
To brick red
It will go through a series of colour changes
What is the colour change for starch
Iodine is orange yellow
It will result in blacky blue
What is the copier change for lipids and fats
Cloudy white
What is the colour change for proteins
Biuret reagent is light blue
It will turn pink purple
What is the iodine test usually used for
Test for starch in plants for photosynthesis
What can also be used in the lipid and fats test
Sudan III is added to the mixture and it forms a red stained layer on the surface of the water if it is a positive test for fats
What do you need to do to the benedict solution
Heat it
What is the emulsion test
The alternative test for lipids by using ethanol
