The amino acid that develops an …
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Meghna Thapar 5 years, 6 months ago
Ninhydrin reacts with the α-amino group of primary amino acids producing 'Ruhemann's purple'. The chromophore formed is the same for all primary amino acids. The intensity of the colour formed depends on the number and chemical nature of the amino groups being analysed. The optimum pH for the overall reaction is 5.5. Free amino groups will react with the ninhydrin reagent to yield a purple solution. Almost all amino acids contain a free amino group (except proline and hydroxyproline). Some proteins also give a positive test with ninhydrin. Proline and hydroxy proline give a yellow spot upon reaction with Nihhydrin. This color difference is due to the lack of a primary amine that all of the other protein amino acids have.
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