Skip to content
Clear highlightsClear Highlight Report a problem

Test for Proteins

The Biuret test detects the presence of peptide bonds.Add an equal volume of sodium hydroxide to the sample.Add a few drops of very dilute (0.05%) copper(II) sulfate solution and mix gently.A purple colouration indicates the presence of peptide bonds.If no protein is present, the solution remains blue.

Read the text

Read the text and highlight anything you think is important. When you go on, the text is hidden and you answer from memory.

Next

Specification: OCR Biology A (H020), AS-level, 2.1.2 Biological molecules. Topic: Biological Molecules.

Key terms in this lesson

peptide bond
The covalent bond formed between two amino acids by a condensation reaction.

More in Biological Molecules

All 63 lessons in Biological Molecules · All OCR AS-level Biology topics