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LIPODEX® cyclodextrin phases
Capillary columns for GC enantiomer separation
Features
Base material: cyclic oligosaccharides consisting of six (α-cyclodextrin), seven (β-cyclodextrin) or eight (γ-cyclodextrin) glucose units bonded through α-1,4-linkages
Regioselective alkylation and/or acylation of the hydroxyl groups leads to lipophilic phases with varying enantioselectivity, which are well suited for GC enantiomer analyses.
Important advantage: many compounds can be analyzed without derivatization (however, for certain substances enantioselectivity can be favorably influenced by formation of derivatives)
A large number of separations have been achieved, however, it is not possible to make a general prediction, which phase could solve a given separation task. Even for compounds with small structural differences or within homologous series the enantiodifferentiation can be quite different. The descriptions below list some of the typical separations possible with individual phases.
For applications click here.
     
LIPODEX® A · hexakis-(2,3,6-tri-O-pentyl)-α-cyclodextrin
  n = 1, R2 = R3 = R6 = pentyl
Recommended for carbohydrates, polyols, diols, hydroxycarboxylic acid esters, (epoxy‑) alcohols, glycerol derivatives, spiroacetals, ketones, alkyl halides
Max. temperature for isothermal operation 200 °C, max. temperature for short isotherms in a temperature program 220 °C
     
LIPODEX® B · hexakis-(2,6-di-O-pentyl-3-O-acetyl)-α-cyclodextrin
  n = 1, R2 = R6 = pentyl, R3 = acetyl
Recommended for lactones, diols (cyclic carbonates), aminols, aldols (O-TFA), glycerol derivatives (cyclic carbonates)
Max. temperature for isothermal operation 200 °C, max. temperature for short isotherms in a temperature program 220 °C
     
LIPODEX® C · heptakis-(2,3,6-tri-O-pentyl)-β-cyclodextrin
  n = 2, R2 = R3 = R6 = pentyl
Recommended for alcohols, cyanhydrins, olefins, hydroxycarboxylic acid esters, alkyl halides
Max. temperature for isothermal operation 200 °C, max. temperature for short isotherms in a temperature program 220 °C
     
LIPODEX® D · heptakis-(2,6-di-O-pentyl-3-O-acetyl)-β-cyclodextrin
  n = 2, R2 = R6 = pentyl, R3 = acetyl
Recommended for amines (TFA), aminols (TFA), trans-cycloalkane-1,2-diols, trans-cycloalkane-1,3-diols (TFA), β-amino acid esters
Max. temperature for isothermal operation 200 °C, max. temperature for short isotherms in a temperature program 220 °C
   
LIPODEX® E · octakis-(2,6-di-O-pentyl-3-O-butyryl)-γ-cyclodextrin
  n = 3, R2 = R6 = pentyl, R3 = butyryl
Recommended for α-amino acids, α- and β-hydroxycarboxylic acid esters, alcohols (TFA), diols (TFA), ketones, pheromones (cyclic acetals), amines, alkyl halides, lactones
Max. temperature for isothermal operation 200 °C, max. temperature for short isotherms in a temperature program 220 °C
     
LIPODEX® G · octakis-(2,3-di-O-pentyl-6-O-methyl)-γ-cyclodextrin
  n = 3, R2 = R3 = pentyl, R6 = methyl
Recommended for menthol isomers, ketones, alcohols, carboxylic acid esters, terpenes
Max. temperature for isothermal operation 220 °C, max. temperature for short isotherms in a temperature program 240 °C


Ordering information
Phase (all columns 0.4 mm OD) Length: 10 m 25 m 50 m
  ID: 0.10 mm 0.25 mm 0.25 mm
FS-LIPODEX® A     723360.25 723360.50
FS-LIPODEX® B     723362.25 723362.50
FS-LIPODEX® C     723364.25 723364.50
FS-LIPODEX® D     723366.25 723366.50
FS-LIPODEX® E   723382.10 723368.25 723368.50
FS-LIPODEX® G     723379.25 723379.50
Water as solvent is strictly forbidden for all cyclodextrin phases. We recommend to dry the sample with our CHROMAFIX® Dry (Na2SO4) cartridges and to dissolve it in an appropriate nonpolar solvent in any case.

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