Question

Describe one test for detecting the presence of protein in a food

Answer 1

Answer:

Test for Proteins:

Biuret test – Given sample food + Aqueous copper sulfate → Violet colouration confirms the presence of Proteins

Xanthoproteic test – Given sample food + Nitric acid → Yellow colour solution confirms the presence of proteins.

Millions test – Given sample food + Mercuric sulfate in the presence of sodium nitrite and sulfuric acid → Brick red colour solution confirms the presence of proteins.

Ninhydrin test – Given sample food + Pyridine solution of ninhydrin → Violet colour solution confirms the presence of proteins.