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All the Answers to Plot Column Stability
Traditional porous layer open tubular (PLOT) columns are built with a 5-50micron layer of particles adhered to tubing walls. Because this layer of particles generally lacks stability, the columnsmust be used very carefully to avoid particle release which causes unpredictable changes in retention time and flow behaviour.
Restek have now changed all that with their newmanufacturing process that produces PLOT columns with concentric stabilized adsorption layers – significantly improving particle stability. This new generation of PLOT columns exhibits a constant flow behaviour and have significantly improvedmechanical stability, resulting in easier operation, better chromatography,more reproducible retention times, virtually no spiking and delivers longer column lifetimes.
This Restek innovative stabilisation chemistry technology is currently applied to RT® QS-BOND, RT®
-Alumina BOND, RT® -S-BOND and RT®
-MSieve 5A, RT® -U-BOND columns.
For applications where flow is important, such as with Deans switching, this new PLOT columnmanufacturing process results in greater consistency in both column coating thickness and flow restriction. Restek’s flow restriction factor (F) allows users to evaluate flow restriction reproducibility. It is based on the retention time of an unretained compound and can be used to assess the degree of restriction of the column and to evaluate the reproducibility of the column coating process.
This significant advance in PLOT column technology fromRestek is an important gain especially for the petrochemical industry, wheremore efficient, reproducible analyses of permanent gases, solvents and hydrocarbons can now be achieved.
www.thamesrestek.co.uk.
-Q-BOND, RT® -
New Line of Solvent Pumps, Pressure Vessels andMixers
Supercritical Fluid Technologies, Inc. (SFT) now offers an extensive selection of solvent pumpswith awide range of flowrates and operating pressures tomeet demanding application needs.
Our newly expanding line of equipment includes solvent pumps for: high pressure liquid chromatography
(HPLC), preparative HPLC, flash chromatography, and reagent addition modules for solvent and reactantmetering. These versatile pumps are well suited to bothQC and research applications.
Designed with the latest technology to ensure high performance, maximum flexibility and functionality, our pumps are constructed with durable components and quality materials for longevity and enhanced performance to consistently meet the evolving demands of today’s laboratory. These pumps feature precise digital control and are very easy to operate.
SFT’s new mixers and vessels are well suited for a variety of applications requiring high pressure. Standard vessels operate up to 10,000 psi and are available in sizes ranging from 5 ml to 5 L capacity. Powerful magnetic mixers provide the vigorous agitation required for high pressure reaction chemistry.
For more information visit us on-line at
www.supercriticalfluids.com.
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