M/s. Gulf Analytical Supplies FZE have an established presence of nearly a decade in the middle east market and have a dominant presence in the field of separation science comprising mainly of chromatography with more than thousand columns supplied in the Middle East.  With the help of application support and technical support from our principals, we are the pioneers in the field of column chromatography.
 
 
 

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Products / SGE Analytical Science / GC Capillary columns

GC Capillary columns
GC Capillary Columns Polarity Scale
SGE strives to develop a better understanding of the interactions of the solute molecules with the GC stationary phase types in our product range and those we could design and synthesize. The objective is to be able to assist you the chromatographer to select a GC stationary phase for the separation of particular classes of compounds.

All chromatographers want the best separation and need to focus on the key parameters that influence the resolution equation. R can be viewed in three sections consisting of variables which influence capillary column efficiency, retention and selectivity.

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Another way of viewing the resolution equation from the GC capillary column perspective is that quality impacts the capillary column efficiency, the physical dimensions of the capillary column influence retention and the phase chemistry dictates selectivity. Inevitably, many GC operators focus on flow rates and temperatures because of their importance in getting good peak shapes and nice separations – rarely do we pay attention to how the phase can have such an effect on the relative retention time. The fine detail of the chromatography comes in the interaction with the phase.
Stationary Phase Polarity
A discussion on phase chemistry inevitably involves a reference to polarity – polarity in general terms and where phases fit along a linear polarity scale – but there is more to it than this. There are different types of interactions based on the different types of functionality of the GC stationary phase polymer. In trying to create a scaled representation of the mechanisms of separation SGE has placed the stationary phases against a qualitative scale, although this scale is analyte dependent. The scale reflects the relative ability of phases to interact with particular types of analytes.

The scales shown in the 3D Phase Polarity diagram below, are qualitative rather than quantitative and have been derived from experimental work studying the retention of different analytes in the different types of stationary phases. Essentially the focus has been to develop a three dimensional representation of where each phase fits as a point on a plot of three classic bonding mechanisms - ‘Van der Waals’, H-bonding and p-bonding.

 
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