Astec chiraldex a-da gc col 30 m 0,25 mm

Incorporates a phase consisting of a 2,6-di-CD Type: α (alpha)
Derivative: Dialkyl
Temp. Limits: -10 °C to 200 °C (isothermal) or 220 °C (programmed)
Incorporates a phase consisting of a 2,6-di-O-pentyl-3-methoxy derivative of α-cyclodextrin. This phase is good for separations of heterocyclic amines. It has different selectivity from other phases and often shows reversal in elution from the PH phases.
The dipentylated derivatives of alpha, beta and gamma cyclodextrin show pronounced selectivity differences based on the size, shape and functionality of the analyte. Strong evidence exists for inclusion complexation which is the basic driving mechanism and, therefore, resolution is affected by sample load. The beta-cyclodextrin form has the broadest applicability. Sample volumes under 1 microliter at concentrations of 5 mg/mL are typical with the 100/1 split ratio.
Features:
Hydrophobic surface
Pronounced selectivity differences based on analyte size, shape and functionality
Separates heterocyclic amines
Different selectivity from other cyclodextrin derivatives
Often shows reversal in elution order from PH series
Selectivity priorities:
Alpha…Simple epoxides, cyclic ethers, linear substituted alkanes
Beta…Heterocyclic amines
Gamma…Naphthyl analogs
Mechanism Observations:
Stronger inclusion for DA and, therefore, size selectivity is important.
Critical temperature dependence for enantioselectivity. Above this temperature no separation occurs.O-pentyl-3-methoxy derivative of α-cyclodextrin. This phase is good for separations of heterocyclic amines. It has different selectivity from other phases and often shows reversal in elution from the PH phases. MAOT = 200 °C isothermal, 220 °C programmed.