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Products / SGE Analytical Science / GC Capillary columns

GC Capillary columns
Choosing the Right Phase for Your Separation
So how can you use this elaborate explanation of phases and bonding types? The answer is simple! In separation science we seek solutions in resolving complex mixtures and a “one-phase fits all” is more a hope than a reality. Here SGE has explored different phases from a polarity scale to assist the chromatographer to choose the best combination of phases which provide an orthogonal solution rather than a simple variation of a theme.

Take for example the separation of aromatics on the polyethylene glycol capillary column BP20 (H-bonding) compared to BP1 where the primary interaction is Van der Waals. Whereas para- and meta-xylene are unresolved on BP1, they are clearly resolved on BP20 with a corresponding change in elution order to the alkanes. This is an interesting interaction because the aromatic xylenes have been attracted by the H-bond rich BP20. It is not a totally ‘one or the other’ situation when judging the contribution of H-bond and p-bond affinities, because they have some affinity for each other.

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A higher component separation is demonstrated with a series of hydrocarbons run on a relatively non-polar phase (BPX5, on the x-axis in figure above right) and on a highly polar BPX90 with the retention times plotted on the y-axis. If the hydrocarbon family is split up on the basis of unsaturated groups, this extra dimension shown in color (chemical group) reveals that the plot shows strong correlations for retention characteristics and functional chemistry.
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