What type of bond is necessary to obtain a positive Biuret result?

A positive Biuret test result indicates the presence of peptide bonds. These bonds are formed between amino acids in a protein. The Biuret reagent, which contains copper ions, reacts with the peptide bonds and turns a violet color. This color change is a positive Biuret test result. Therefore, the type of bond necessary to obtain a positive Biuret result is a peptide bond.