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
Stationary Phase Polymer
SGE has designed its phase synthesis so that most capillary columns may be washed with solvent to remove any contamination. When a capillary column’s performance has deteriorated from extended use or contamination, performance can often be restored though washing with a suitable solvent. See page 196 for details and equipment available for washing capillary columns.
Rigorous Performance Testing
Test criteria are selected based on the applications that different capillary column types are targeted for, to ensure the capillary column meets the standards for that analysis. General purpose capillary columns are tested to ensure they meet inertness standards for difficult to chromatograph compounds, and run at conditions and levels designed to highlight variations in capillary column performance. For example, SGE’s non-polar phase BPX5 is tested using active probes such as n-decylamine and 2,4-dinitrophenol chromatographed at low concentrations (1-2 nanogram on capillary column for 0.25 Ám film thickness) and with sufficient retained time on the run to induce tailing on all but the most highly inert capillary column. SGE does not offer separate ranges of capillary columns of different performance levels – all SGE GC capillary columns meet these high standards.
Retention Time and Consistency
Because SGE controls the capillary column fabrication process from beginning to end we are also able to achieve remarkably consistent retention characteristics from column to column. When a method is established on an SGE column, the same separation can be expected column after column.
Thermal Stability
A long term issue in capillary GC is the breakdown of the stationary phase in the capillary column at elevated temperatures which leads to rising and noisy baseline signals thereby limiting sensitivity of the analysis. Stationary phase breakdown at elevated temperatures cannot be eliminated but it can be reduced dramatically through improving the technology. SGE developed, and was the first to introduce, silarylene - containing polymers such as silphenylene stationary phases in 1987. Silphenylene phases replace some of the oxygen atoms in the backbone of the siloxane polymer with aromatic groups. This led to a dramatically improved thermal stability for GC phases with silphenylene phases now available in a wide range of polarities and selectivities. SGE capillary columns are monitored for bleed performance with rigorous standards established. Bleed is measured and specified in terms of detector signal and calibrated to "nanograms of siloxane per second" eluted from the capillary columns. The test is performed at the maximum operating temperature for the capillary column.
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