Food Test Practical Flashcards
What is the purpose of the food tests practical?
To test for the presence of starch, sugar, protein, and fat in foods.
Which test is used to detect starch?
Iodine solution test.
What is a positive result for starch using iodine?
Colour change from brown/orange to blue-black.
Which test is used to detect sugar (glucose)?
Benedict’s test.
What is a positive result for sugar using Benedict’s?
Colour change from blue to green/yellow/orange/red (depending on amount).
What must you do when using Benedict’s solution?
Heat the mixture in a water bath at about 75°C.
Which test is used to detect protein?
Biuret test.
What is a positive result for protein using Biuret?
Colour change from blue to purple.
Which test is used to detect fat (lipids)?
Sudan III test.
What is a positive result for fat using Sudan III?
A red-stained oil layer separates and floats on top.
What is the safety precaution when using Sudan III?
It is flammable—keep away from flames.
