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

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

J & K CETJ & K CET 2008Biomolecules

Solution:

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