Which of the following will not give a purple | vedclass

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(C) Ninhydrin reacts with $\alpha$-amino acids to form a purple-colored complex known as Ruhemann's purple.This reaction requires the presence of a fr

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Proline

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(C) Ninhydrin reacts with $\alpha$-amino acids to form a purple-colored complex known as Ruhemann's purple.This reaction requires the presence of a free primary amino group ($-NH_2$ group).Proline is an imino acid where the nitrogen atom is part of a five-membered pyrrolidine ring.Because the nitrogen in proline is a secondary amine $(-NH-)$ rather than a primary amine,it reacts with ninhydrin to produce a yellow-colored product instead of the characteristic purple color.

Which of the following will not give a purple color with ninhydrin?

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