Astec chiraldex g-dp gc column 30 m 0,25 mm

CD Type: γ (gamma)
Derivative: Dipropionyl
Temp. Limits: -10 °C to 200 °C (isothermal) or 220 °C (programmed)
Incorporates a phase consisting of a 2,3-di-O-propionyl-6-t-butyl silyl derivative of γ-cyclodextrin. This phase exhibits good hydrolytic stability, broad chiral selectivity, and are excellent for aliphatic and aromatic amines. It is also good for many aliphatic and some aromatic esters as well as exhibiting high efficiency and resolution at low retention times for polar racemates.
Features:
Broad chiral selectivity
Good hydrolytic stability
Thermal limit 200/220 °C
Excellent for aromatic and aliphatic amines
Good for many aliphatic and some aromatic esters
High efficiency and resolution at low retention times for polar racemates
Mechanism Observations:
Mostly surface interactions
Fused ring structures better selectivity on gamma
Acids have better selectivity as methyl rather than ethyl esters
Size Selectivity:
Both speed and sample capacity indicate a surface type mechanism for very polar racemates. Large bulky molecules still require a larger surface area than beta provides, therefore, an increase in selectivity is seen on the gamma derivative for fused ring structures. The smaller alpha cavity offered no selectivity while the beta covered the largest range of molecular sizes but the choice between beta and gamma is compound dependent for this phase.