Separation of enantiomers on packed columns containing optically active diamide phases

Chromatography of fourteen protein amino acids has been studied on 2-4- m long packed columns containing chiral diamide phases. Twelve of the thirteen optically active compounds examined could be resolved, with R greater than or equal to 1 in many instances. Two of the phases, N-docosanoyl-L-valine tert.-butylamide and N-lauroyl-L-valine 2-methyl-2-hepatadecylamide, can be employed at temperatures as high as 190 degrees and 180 degrees, respectively, without losing their efficiency, even after prolonged use. The problem of peak overlap in the analysis of mixtures of different amino acids was examined and partially solved.