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Ordering Information: B-DM | G-DMAstec CHIRALDEX B-DM and G-DM capillary GC columns incorporate a phase consisting of a 2,3-di-O-methyl-6-t-butyl silyl derivative of either β- or γ-cyclodextrin. These phases exhibit broad chiral selectivity, resolving aliphatic, olefenic, and aromatic enantiomers. They combine the selectivities of the PM and PH phases.
| Type / Name |
Derivative |
β-Phase |
γ-Phase |
Max. Temp.(°C)
Isothermal |
Max. Temp.(°C)
Programmed |
| DM / Dimethyl |
2,3-di-O-methyl-6-t-butyl silyl |
B-DM |
G-DM |
200 |
220 |
Features
- Broad chiral selectivity
- Combine selectivity of the PM and PH phases
- Short retention, high resolution
- B-DM broadly applicable
- Resolve aliphatic, olefenic and aromatic enantiomers
Mechanism Observations
- Size selectivity present but not dominant as in the DA phases
- Fewer structural requirements
- Characteristic temperature selectivity
Size Selectivity
Size selectivity is evident, therefore, the inclusion mechanism is playing a role in the separation mechanism but does not dominate as it does with the DA phases. The B-DM phase covers a very broad range of molecular sizes and, therefore, has the greatest applicability.
Specific Classes of Compounds Separated
Use this table as a reference to help determine the proper column based on the analyte(s) of interest.
| Type |
Compound Class |
| B-DM |
Aromatic alcohols, short chain alcohols <C6, amines, amino alcohols, epoxides, cyclic ketones, diols, aromatic acids, and esters (many of these underivatized). |
| G-DM |
Aromatic alcohols >C5, polar amines, bulky amines, aromatic amines, halogenated aliphatic acids, and derivatized long chain diols. |
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