精品久久久久久中文字幕动漫_亚洲欧洲精品在线_99精品欧美一区二区三区综合在线_无码 制服 丝袜 国产 另类_久久精品男女_日本亚洲欧美在线_国产精品精品视频_久热综合在线亚洲精品_日韩欧美视频在线免费观看_亚洲成人中文字幕

SUPELCO Astec CHIRALDEX G-TA手性氣相色譜柱 毛細(xì)管柱
 

• CD Type: γ (gamma)
• 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 γ-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)
• Diols
• Lactones
• Ketones
• Phthalides
• Sulfoxides

Mechanism Observations:

   Strong dipole-dipole interactionsLonger alkyl chain; greater retention; increase in enantioselectivity up to C4/C5Halogens 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.

Included in GC Screening Kit 71030AST.

SUPELCO Astec CHIRALDEX G-TA手性氣相色譜柱 毛細(xì)管柱 訂貨信息：