Last ten years (2008-2018) of chiral ligand-exchange chromatography in HPLC: An updated review

Journal of Separation Science
Federica IanniBenedetto Natalini

Abstract

Chiral ligand-exchange chromatography is one of the elective strategies for the direct enantioresolution of small chelating compounds: amino acids, diamines, amino alcohols, diols, small peptides, etc. Unlike other methods, the interaction between chiral selector and analyte enantiomers is mediated by a cation, thus producing diastereomeric ternary complexes. Two main approaches are conventionally applied in chiral ligand-exchange chromatography. The first relies upon chiral stationary phases where the chiral selector is either covalently immobilized or physically adsorbed onto suitable packing materials (coated phases). In the second approach, chiral molecules are added to the eluent, thus generating chiral eluent systems. Among the advantages of chiral ligand-exchange chromatography, the generation of UV/vis-active metal complexes, and the use of commercially available or easy-to-synthesize chiral selectors, in combination to rather inexpensive achiral columns for coated phases and chiral eluents, are noteworthy. Besides amino acids and amino alcohols, other species have proven suitable for chiral ligand-exchange chromatography applications. Recently, the use of either chiral ionic liquids or micellar liquid chromatography sy...Continue Reading

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