A rapid thin-layer chromatographic (TLC) method has been developed for the separation and purity control of the enantiomers of several unusual aromatic amino acids (phenylalanine, tyrosine, histidine, and tryptophan analogs, and analogs containing tetralin or 1,2,3,4-tetrahydroisoquinoline skeletons) synthesized in racemic or homochiral form. The compounds were analyzed on Macherey-Nagel Chiralplate TLC plates with acetonitrile-methanol- water, 4 + 1 + 1 or 4 + 1 + 2 (v/v) or acetonitrile-methanol-water- diisopropylethylamine, 4 + 1 + 2 + 0.1 (v/v) as mobile phase. The compounds were visualized with ninhydrin. Good separation and reliable results were usually obtained. The configurations of the asymmetric centers of the investigated amino acids were determined either by use of enantiomerically pure amino acids as standards or by use of enzymes, e.g. α-chymotrypsin, Lamino acid oxidase or carboxypeptidase A. By this method the configurations of unnatural amino acids built into peptides can also be determined after hydrolysis of the peptides.
|Number of pages||1|
|Journal||Journal of Planar Chromatography - Modern TLC|
|Publication status||Published - szept. 1 1998|
ASJC Scopus subject areas
- Analytical Chemistry
- Clinical Biochemistry