diketohydrindylidene-diketohydrindamine

di·ke·to·hy·drin·dyl·i·dene-di·ke·to·hy·drin·da·mine

(dī-kē'tō-hī'drin-dil'i-dēn dī-kē'tō-hī-drin'dă-mēn), The colored product formed in the reaction of an α-amino acid and ninhydrin (triketohydrindene hydrate); a reaction used in the quantitative assay of α-amino acids.