The α - amino acid which does not give purple colour in the ninhydrin test is

Question

The α - amino acid which does not give purple colour in the ninhydrin test is (A) proline (B) glycine (C) lysine (D) aspartic acid

Tardigrade Admin · Accepted Answer

Ninhydrin test is highly specific for primary amines. Proline being a secondary amine give a yellow orange colour with ninhydrin whereas all other α - amino acids give a blue-purple colour with ninhydrin.

Q. The $α -$ amino acid which does not give purple colour in the ninhydrin test is

proline

glycine

lysine

aspartic acid

Ninhydrin test is highly specific for primary amines. Proline being a secondary amine give a yellow orange colour with ninhydrin whereas all other $α -$ amino acids give a blue-purple colour with ninhydrin.

Q. The α− amino acid which does not give purple colour in the ninhydrin test is