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Compact Information

Most Hydrophobic Columns

The following columns (in alphabetical order) show a pronounced hydrophobic character. Several criteria were considered such as selectivity factors, behaviour towards polar/non-polar analytes, bonding density, homogeneity of the surface, etc. Example:

On CORTEX C18, a highly hydrophobic material, the peak sequence is ethylbenzene/fluorenone, on Synergi POLAR RP, a highly polar material exactly the opposite, fluorenone/ethylbenzene.

Ascentis C18

CORTEX C18

HALO C18

InertSustain C18

Kromasil C18

LUNA C18(2)

Poroshell 120 EC C18

Poroshell 120 HPH C18

Symmetry C18

XBridge C18UPLC BEH C18

XSelect HSS C18

YMS Pro C18 RS

 


Most Polar Columns

The following columns (in alphabetical order) show a pronounced polar character. Several criteria were considered such as selectivity factors, behaviour towards polar/non-polar analytes, bonding density, homogeneity of the surface, etc.

Acclaim PA C16

Coresep 100

HyPurity Advance

Kinetex Biphenyl/Raptor Biphenyl

NUCLEODUR pi2

Obelisc R

Poroshel 120 PFP

Primesep C

Spherisorb ODS 1

Synergi POLAR RP

XSelect CSH Fluoro Phenyl

Zorbax Bonus RP


Peak shape benzylamine

 

The alpha value Benz/Phe (benzylamine/phenol) is to be regarded as a measure of the ion exchange/hydrogen bridge bond ratio. Furthermore, strong tailing and a long retention time or even irreversible adsorption of the strong base benzylamine (alpha value Benz/Phe nominally greater than 20) indicates the tendency of the corresponding stationary phase to strong cation exchange interactions, thus it exhibits a strong polar character. The peak shape of benzylamine ranges from a non-evaluable peak to a fairly symmetrical peak, see example below.

On the following 12 columns (in alphabetical order) the peak shape of benzylamine is good: There are no (accessible) acidic silanol groups on the surface and thus hardly any cation exchange interactions take place, the result is: Symmetrical peaks even with strong bases. Note: The benzylamine test is a very strict test.

Cortecs C18

Discovery C18

Gemini NX

HALO C18

InertSustain C18

NUCLEODUR C18 Gravity

Poroshell 120 EC-C18

Poroshell 120 HPH-C18

SunFire C18

XBridge C18/UPLC BEH C18

XSelect HSS C18

YMS Pro C18 RS