CD Type: α (alpha)
Derivative: Trifluoroacetyl
Temp. Limits: -10 °C to 180 °C (isothermal or programmed)

Incorporates a phase consisting of a 2,6-di-O-pentyl-3-trifluoroacetyl derivative of α-cyclodextrin.

Trifluoroacetylation of the 3 position hydroxyl groups after pentylation of the 2,6 hydroxyl groups creates a phase with high selectivity for oxygen containing analytes in the form of alcohols, ketones, acids, aldehydes, lactones, and halogenated compounds.

  • Separates the widest variety of enantiomers
  • Separates the greatest number of enantiomers
  • Gamma more selective than beta form
  • Unique retention behavior
  • Extraordinary versatility and chiral selectivity

  • Analytes:
  • Useful for homologous series of:
  • Amino acids (primary, secondary, aromatic and aliphatic)
  • Amines (primary, secondary, cyclic, aromatic and halogenated)
  • Amino alcohols
  • Alkanes, hydrogenated alkanes
  • Alcohols (aliphatic and aromatic)
  • Acids (halogenated and hydroxy)
  • Esters (aromatic, aliphatic, hydroxy, di-ester)
  • Diols
  • Lactones
  • Ketones
  • Phthalides
  • Sulfoxides

  • Mechanism Observations
  • Strong dipole-dipole interactions
  • Longer alkyl chain; greater retention; increase in enantioselectivity up to C4/C5
  • Halogens known to favor cavity interaction

Dipole-dipole interactions are commonly identified in the mechanism of separation for TA phases. In a homologous series of alkane enantiomers, identical alpha values are observed regardless of chain length or branching indicating only 1 or 2 carbons may be contributing to chiral recognition. Alpha values are greatly affected by size and polarity of the head group. Functional groups like epoxides, amino alcohols and alcohols can dictate the cyclodextrin selection. Aldehydes, carboxylic acids and epoxides separate better on the gamma while alcohols, alcohol amines and other linear molecules separate better on the beta derivative.

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73003AST Astec® CHIRALDEX® A-TA Capillary GC Column L × I.D. 30 m × 0.25 mm, df 0.12 μm
73004AST Astec® CHIRALDEX® A-TA Capillary GC Column L × I.D. 40 m × 0.25 mm, df 0.12 μm