Astec CHIRALDEX A-DA SUPELCO 手性气相色谱仪液相色谱柱 孔状管柱
 

• 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.

 

Astec CHIRALDEX A-DA SUPELCO 手性气相色谱离子交换柱 毛细管柱

定购数据：

Product #	Description
72003AST	Astec? CHIRALDEX? A-DA 毛细管气相色谱柱 L × I.D. 30 m × 0.25 mm, df 0.12 μm

 

Astec CHIRALDEX A-DA

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