Astec CHIRALDEX A-TA SUPELCO 手性氣相色譜柱 毛細管柱
 

• 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.

Features: 

• 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)
• DiolsLactonesKetones
• 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.

Astec CHIRALDEX A-TA SUPELCO 手性氣相色譜柱 毛細管柱

訂貨信息：

Astec CHIRALDEX A-TA SUPELCO 手性氣相色譜柱 毛細管柱

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