The above reaction is a test of urea because on adding an alkaline solution of copper sulphate to white solid biuret, a violet colour is obtained. Was this answer helpful?

Biuret test is given by an amide linkage. It is present in urea, polypeptides and proteins (polypeptides). Carbohydrates do not have any amide linkages.

Bluret test: When urea is heated just above its melting point it forms a compound called biuret which gives a violet colour with dilute copper sulphate in alkaline medium.

An unknown liquid sample is tested for chemical composition. You receive the following results: iodine test = yellow; biuret test = purple; Benedict's test = red; and paper lipid test = clear. Which of the …

The biuret test typically turns violet in the presence of proteins or peptides, but in this case, the solution would remain the color of the reagent (typically blue).

INSTRUCTION: Check which test (s) will yield a positive result for the given compounds. Biuret Test Ninhydrin Test Hopkin’s Cole Test Xanthoproteic Test Millon’s Test Lead Sulfide Test Albumin …

Jerell has tested samples of food left by the thief. They reacted positively to the Lugol test, Biuret test, and Sudan test. What kind of meal might the thief have eaten to leave those macromolecules in the …

The Biuret test is a chemical test used for detecting the presence of peptide bonds. In the presence of peptides, a copper (II) ion forms violet-coloured coordination complexes in an alkaline solution.

A, B and C are three biomolecules. the results of teh tests performed on them are given below : Molisch's Test Barfoed Test Biuret Test A Positive Negative Negative B Positive Positive Negative C …

2) Saliva Biuret’s test - Saliva + Biuret’s reagent - Colour changes from light blue to purple. Proteins are present. Grease test - On a brown paper, add a drop of saliva - No translucent spot. Fats/oils are …