Fast GC columns by MACHEREY-NAGEL GmbH & Co. KG
Manufacturer MACHEREY-NAGEL GmbH & Co. KG
Efficiency in a laboratory is more and more determined by the sample throughput. The higher the number of samples per time unit run on an instrument, the higher is the productivity of the system. Use of a column with smaller inner diameter combined with very fast temperature programmes can reduce the analysis time by up to 80%, if the injection technique, and also the detection and data acquisition speed are suited for this method. It is important to find the optimum between fast chromatogr... Read more
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Fast GC columns
Efficiency in a laboratory is more and more determined by the sample throughput. The higher the number of samples per time unit run on an instrument, the higher is the productivity of the system.
Use of a column with smaller inner diameter combined with very fast temperature programmes can reduce the analysis time by up to 80%, if the injection technique, and also the detection and data acquisition speed are suited for this method. It is important to find the optimum between fast chromatography and the resolution required. A reduction of the inner diameter is related to a higher column inlet pressure (head pressures of up to 10 bar), and a lower volume flow of the mobile phase, as well as smaller peak widths and sample capacities. This requires the very fast injection of very small sample volumes against a high pressure. High sensitivity detectors with small volume and extremely short response time, as well as a very rapid data acquisition, and processing are required. If using e.g. a mass spectrometer for the evaluation of data, scan rates of up to 6750 dalton/s are necessary to obtain sufficient data points for integration.
Stationary phases for fast GC have to meet special demands due to the high heating rates applied. It is necessary to use specially bonded phases in order to prevent column bleeding.
The manufacturing process of the OPTIMA® columns meets exactly this requirement. OPTIMA® columns show very low bleeding and provide long lifetimes, even when continuously subjected to high heating rates.
References
C. A. Cramers et al., J. Chromatogr. 856 (1999) 315 – 329
C. A. Cramers et al., J. Chromatogr. 842 (1999) 3 – 13
Use of a column with smaller inner diameter combined with very fast temperature programmes can reduce the analysis time by up to 80%, if the injection technique, and also the detection and data acquisition speed are suited for this method. It is important to find the optimum between fast chromatography and the resolution required. A reduction of the inner diameter is related to a higher column inlet pressure (head pressures of up to 10 bar), and a lower volume flow of the mobile phase, as well as smaller peak widths and sample capacities. This requires the very fast injection of very small sample volumes against a high pressure. High sensitivity detectors with small volume and extremely short response time, as well as a very rapid data acquisition, and processing are required. If using e.g. a mass spectrometer for the evaluation of data, scan rates of up to 6750 dalton/s are necessary to obtain sufficient data points for integration.
Stationary phases for fast GC have to meet special demands due to the high heating rates applied. It is necessary to use specially bonded phases in order to prevent column bleeding.
The manufacturing process of the OPTIMA® columns meets exactly this requirement. OPTIMA® columns show very low bleeding and provide long lifetimes, even when continuously subjected to high heating rates.
References
C. A. Cramers et al., J. Chromatogr. 856 (1999) 315 – 329
C. A. Cramers et al., J. Chromatogr. 842 (1999) 3 – 13
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