The 3-amino-derivative of gamma-cyclodextrin as chiral selector of Dns-amino acids in electrokinetic chromatography.
The enantioseparation of the enantiomeric pairs of 10 Dns derivatives of alpha-amino acids was successfully carried out by using for the first time the 3-amino derivative of the gamma-cyclodextrin. The effects of pH and selector concentration on the migration times and the resolutions of analytes were studied in detail. 3-Deoxy-3-amino-2(S),3(R)-gamma-cyclodextrin (GCD3AM) shows very good chiral recognition ability even at very low concentrations at all the three investigated values of pH, as shown by the very large values of selectivity and resolution towards several pairs of amino acids. The role played by the cavity, the substitution site and the protonation equilibria on the observed properties of chiral selectivity, on varying the specific amino acid involved, is discussed.
Giuffrida
A
A
Department of Chemical Sciences, University of Catania, Catania, Italy.
Contino
A
A
Maccarrone
G
G
Messina
M
M
Cucinotta
V
V
D000596:Amino Acids / Q000032:analysis* / Q000737:chemistry; D053801:Capillary Electrochromatography / Q000379:methods*; D003619:Dansyl Compounds / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D012680:Sensitivity and Specificity; D013237:Stereoisomerism; D047408:gamma-Cyclodextrins / Q000737:chemistry*
D000596:Amino Acids; D003619:Dansyl Compounds; D047408:gamma-Cyclodextrins; C023792:gamma-cyclodextrin