Enantiomeric resolution of amino acids by high-performance ligand-exchange chromatography using histidine-bonded silica gel

Chiral chromatographic separations based on ligand exchange

Taking ligand-exchange chromatographic systems as an example, the effect of the stoichiometry of the solute-chiral selector interaction on the efficiency, selectivity and solute peak profile is discussed. Recent achievements and practical applications of chiral ligand-exchange chromatography are also briefly reviewed.

T.l.c. enantiomeric separation of amino acids

Resolution of enantiomers is very important particularly in the fields of asymmetric synthesis, mechanistic studies, geochronology, studies of structure-function relationship of proteins, pharmacology, and medicine. Various chromatographic methods have replaced the classical fractional crystallization, seeding and enzymatic procedures. Of these, t.l.c. provides a direct, simple, and inexpensive method for resolution of enantiomers of amino acids and their derivatives. Ligand exchange, ion exchange, and molecular inclusion complexation have been the basis of t.l.c. resolution of enantiomers of amino acids and their derivatives. The innovation of new plate types, and methods of development and detection have renewed interest in the direct resolution of enantiomers of amino acids, their derivatives and a variety of other compounds by t.l.c. The present report provides an overview of some of the more recent approaches to the direct t.l.c. resolution of amino acids and their derivatives together with special advantages and scope of t.l.c.