Biuret test Flashcards
1
Q
How do you test for protein?
A
Place one-two spatulas of the food sample into a test tube or 1 cm3 if the sample is liquid. Add about 1 cm3 depth of water to the tube and stir to mix.
Add an equal volume of potassium hydroxide solution to the tube and stir.
Add two drops of copper sulfate solution and stir for two minutes.
Record the colour of the solution.
2
Q
What colour shows a positive test for the biuret test
A
Purple/Mauve
3
Q
What colour shows a negative test for the biuret test
A
Remains a light blue colour,
