and nitrite reaction:
With aldehyde reaction:
Reaction with DNFB:
Reaction of carboxyl groups The carboxyl groups of amino acids, like other organic acids, can occur under certain conditions, such as acylation, esterification, decarboxylase and salt reaction.
Indanone hydrate reaction (Ninhydrin reaction) α-amino acid and indanone in weak acidic solution of the CPC heat, after the reaction by the dehydration of Carboxymethyl indanone, and then with the hydration of the Indanone three ketone reaction to produce purplish red, the final blue matter. This color reaction is often used for colorimetric determination of α-amino acids and color analysis.